Rare earth elements in a historical mining district (south-west Spain): Hydrogeochemical behaviour and seasonal variability.
e;as M, Macías F Abstract This work deals with the distribution of rare earth elements (REE) in the abandoned Tharsis mines under different hydrological conditions. High concentrations of REE were observed; mean value of 1747 μg/L. The highest concentrations of REE were recorded during the dry period (DP, mean of 2220 μg/L) due to high evaporation and strong water-rock interactions. However, some sampling points showed the highest REE concentrations during the wet period (WP) due to the washing out of large dumps during intense rainfall. The concentration of REE shows a positive correlation ...
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: González RM, Cánovas CR, Olías M, Macías F Tags: Chemosphere Source Type: research
Formation and inhibition of polycyclic aromatic hydrocarbons from the gasification of cyanobacterial biomass in supercritical water.
Abstract Polycyclic aromatic hydrocarbons (PAHs) formation and inhibition from supercritical water gasification (SCWG) of cyanobacterial biomass were investigated. High reaction temperature, long residence time, and low feedstock concentration favoured higher molecular weight (HMW) PAH formation. The total PAH yield reached 34.80 μg g-1 at 500 °C, 22.5 MPa, and 10 min. The main PAHs formed in the liquid phase and the solid residue were 3-ring and 4-ring PAHs, which were generated from the cycloaddition reaction of lower molecular weight (LMW) PAHs. In addition, 2-ring PAHs were prod...
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Zhang H, Wang C, Zhang X, Zhang R, Ding L Tags: Chemosphere Source Type: research
Microplastics from consumer plastic food containers: Are we consuming it?
This study demonstrates that new plastic containers can be an important source of direct human and environmental exposure to microplastics. Most importantly, our results indicated that necessary attention must be given to morphological features of realistic MPs when evaluating their risks to humans and the environment. PMID: 32464756 [PubMed - in process] (Source: Chemosphere)
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Fadare OO, Wan B, Guo LH, Zhao L Tags: Chemosphere Source Type: research
Toxicity characterization of surface sediments from a Mediterranean coastal lagoon.
M, León VM Abstract The occurrence of bioactive compounds and contaminant-associated effects was assessed by means of in vivo and in vitro assays using different extractable fractions of surface sediments from a contaminated coastal lagoon (Mar Menor, SE Spain). Sediment elutriates and clean seawater, previously exposed to whole sediment, were used for assessing the in vivo toxicity on embryo development of the sea urchin Paracentrotus lividus. Agonist and antagonist activities relating to estrogen and androgen receptors and agonist activities on aryl hydrocarbon receptor (expressed as ethoxy...
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Martínez-Gómez C, Valdehita A, Vethaak AD, Navas JM, León VM Tags: Chemosphere Source Type: research
Mechanism of simultaneous removal of aluminum and fluoride from aqueous solution by La/Mg/Si-activated carbon.
Abstract La/Mg/Si-activated carbon derived from palm shell has been a suitable material for removal of aluminum and fluoride from aqueous solution. In the study, the mechanism of simultaneous removal of aluminum and fluoride by La/Mg/Si-activated carbon (La/Mg/Si-AC) was investigated to understand its high efficiency. It was found that the removal of aluminum and fluoride by La/Mg/Si-AC was favored at lower pH compared to the point of zero charge of La/Mg/Si-AC and high temperature. Adsorption capacity of Al(OH)4- was about 10 times higher than that of F- due to the strong binding affinity of Al(OH)4- on protonate...
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Kim M, Choong CE, Hyun S, Park CM, Lee G Tags: Chemosphere Source Type: research
Photolysis dynamics of m- and o-fluorophenol: Substitution effects on tunneling mechanism.
Abstract The photolysis dynamics of m-fluorophenol (m-FPhOH) and o-fluorophenol (o-FPhOH) have been investigated with time-resolved velocity map imaging (TR-VMI) and time-resolved ion-yield (TR-IY) techniques. Following excitation to the origin of S1 (ππ∗) state of m- and o-FPhOH, H atoms elimination mediated by tunneling through the potential barrier under the S1 (ππ∗)/S2 (πσ∗) conical intersection (CI) has been observed as a Gaussian feature signal centered at a total kinetic energy release (TKER) of ∼6000 cm-1 for both molecules. The quantum tunneling mechanism...
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Deng X, Tang Y, Song X, Liu K, Gu Z, Zhang B Tags: Chemosphere Source Type: research
The livestock growth-promoter zeranol facilitates GLUT4 translocation in 3T3 L1 adipocytes.
Abstract Zeranol is an approved but controversial growth-promoting agent for livestock in North America. It is a mycotoxin metabolite secreted by the Fusarium family fungi. The regulatory bodies in this region have established the acceptable daily intake and exposure below the level would not significantly increase the health risk for humans. However, their European counterparts have yet to establish an acceptable level and do not permit the use of this agent in farm animals. Given the growth-promoting ability of zeranol, its effect on energy metabolism was investigated in the current study. Our results indicated ...
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Tan YQ, Li Q, Wang L, Chiu-Leung LC, Leung LK Tags: Chemosphere Source Type: research
Identification of heme oxygenase-1 from golden pompano (Trachinotus ovatus) and response of Nrf2/HO-1 signaling pathway to copper-induced oxidative stress.
Abstract Heme oxygenase-1(HO-1) is a stress-inducible enzyme that mediates antioxidative and cytoprotective effects to maintain cellular redox homeostasis. In the present study, the full sequence of HO-1 was cloned from golden pompano(Trachinotus ovatus) by RT-PCR and RACE-PCR. The full cDNA sequence of HO-1 was 1349 bp in length which comprised of a 726 bp open reading frame (ORF) preceded by 262 bp 5'-untranslated region (UTR), and followed by a 360 bp 3'UTR, encoding 241 amino acid residues. Phylogenetic analysis revealed that HO-1 showed highest similarity to that of Takifugu rubripes. Tissue distribution...
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Xie J, He X, Fang H, Liao S, Liu Y, Tian L, Niu J Tags: Chemosphere Source Type: research
Interactions between activated sludge extracellular polymeric substances and model carrier surfaces in WWTPs: A combination of QCM-D, AFM and XDLVO prediction.
Abstract To understand the biofilm formation of biofilm-based processes in wastewater treatment plants (WWTPs), the interaction mechanisms between extracted extracellular polymeric substances (EPS) and three model carrier surfaces (i.e., negatively charged hydrophilic silica, positively charged hydrophilic alumina, and neutral charged hydrophobic polystyrene) were investigated employing a laboratory quartz crystal microbalance with dissipation monitoring equipment (QCM-D) and an atomic force microscope (AFM). The data suggested that surface charge and hydrophobicity of both EPS and carriers played significant role...
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Ou Q, Xu Y, Li X, He Q, Liu C, Zhou X, Wu Z, Huang R, Song J, Huangfu X Tags: Chemosphere Source Type: research
Three-dimensional Co/Ni bimetallic organic frameworks for high-efficient catalytic ozonation of atrazine: Mechanism, effect parameters, and degradation pathways analysis.
Abstract Herein, the potential of bimetallic MOFs in catalytic ozonation was investigated for the first time. Three novel ozonation catalysts, i.e. cobalt-based, nickel-based and cobalt/nickel-based metal-organic frameworks (Co-MOF, Ni-MOF and Co/Ni-MOF), were synthesized, characterized by XRD, SEM, N2 sorption-desorption isotherms, FTIR and XPS, and applied in catalytic ozonation for atrazine removal. It was found that the catalysts showed outstanding performance in the catalytic ozonation, especially Co/Ni-MOF which was attributed to multiple metal sites, higher coordination unsaturation, metal centers with larg...
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Ye G, Luo P, Zhao Y, Qiu G, Hu Y, Preis S, Wei C Tags: Chemosphere Source Type: research
Mushroom residue modification enhances phytoremediation potential of Paulownia fortunei to lead-zinc slag.
In this study, mushroom residue was adding in lead-zinc slag to enhance the phytoremediation potential of P. fortunei, the effects of three treatments (lead-zinc slag, red soil, lead-zinc slag + 10% (m/m) mushroom residue) on the growth, physiology and microstructure of P. fortunei were determined. The results showed that the addition of mushroom residue increased the biomass, plant height and chlorophyll concentration of P. fortunei, indicating that the addition of mushroom residue can facilitate the growth of P. fortunei. Moreover, the proportions of oxalate-Pb forms and phosphate-Zn were do...
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Han L, Chen Y, Chen M, Wu Y, Su R, Du L, Liu Z Tags: Chemosphere Source Type: research
Three-years monitoring of PM2.5 and scattering coefficients in Shanghai, China.
Abstract The absorption and scattering of aerosols are critical factors that influence in global climate and visibility degradation. From January 2013 to December 2015, aerosol scattering coefficients, PM2.5, and meteorological parameters were continuously measured at a monitoring site in Shanghai, China. The annual means of scattering coefficients were 312.3, 232.1, and 261.9 Mm-1 for the years 2013, 2014, and 2015, respectively. The corresponding values for PM2.5 were 61.6, 51.6, and 52.9 μg/m3. Compared with the average scattering coefficient of the year 2013, those of 2014 and 2015decreased by 26%...
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Zhang L, Qiao L, Lan J, Yan Y, Wang L Tags: Chemosphere Source Type: research
A facile strategy for photocatalytic degradation of seven neonicotinoids over sulfur and oxygen co-doped carbon nitride.
Abstract Mounting evidence highlights the negative impacts of neonicotinoids on non-target organisms and ecosystem, yet there are a few of methods to address the residual neonicotinoids in environment. Herein, series of sulfur and oxygen co-doped carbon nitride (SOCNx) were successfully synthesized via one-step thermal polymerization and applied in photodegradation of multi-neonicotinoids (dinotefuran, acetamiprid, clothianidin, thiacloprid, imidacloprid, nitenpyram and thiamethoxam) simultaneously for the first time. Unique tubular structure was observed at the specific doping ratio, which enhanced both mass tran...
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Liu X, Li C, Zhang B, Yuan M, Ma Y, Kong F Tags: Chemosphere Source Type: research
Discriminant models on mitochondrial toxicity improved by consensus modeling and resolving imbalance in training.
In this study, five machine learning algorithms and twelve types of molecular fingerprints were employed to generate QSAR discriminant models for mitochondrial toxicity. A threshold moving method was adopted to resolve the imbalance issue in the training data. Consensus of the models by an averaging probability strategy improved prediction performance. The best model has correct classification rates of 81.8% and 88.3% in ten-fold cross validation and external validation, respectively. Substructures such as phenol, carboxylic acid, nitro and arylchloride were found informative through analysis of information gain and freque...
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Tang W, Chen J, Hong H Tags: Chemosphere Source Type: research
Mitigation of environmentally-related hazardous pollutants from water matrices using nanostructured materials - A review.
Abstract An unprecedented rise in population growth and rapid worldwide industrial development are associated with the increasing discharge of a range of toxic and baleful compounds. These toxic pollutants including dyes, endocrine-disrupters, heavy metals, personal care products, and pharmaceuticals are destructing nature's balance and intensifying environmental toxicity at a disquieting rate. Therefore, finding better, novel and more environmentally sound approaches for wastewater remediation are of great importance. Nanoscale materials have opened up some new horizons in various fields of science and technology...
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Bilal M, Rasheed T, Mehmood S, Tang H, Ferreira LFR, Bharagava RN, Iqbal HMN Tags: Chemosphere Source Type: research
Evaluation of cold-weather wastewater nitrification technology for removal of polar chemicals of emerging concern from rural Manitoba wastewaters.
In this study, we evaluated removal of polar chemicals of emerging concern (CECs), including pharmaceuticals, personal care products, and pesticides, at SAGR installations in two Manitoba First Nations communities (MCN and LPFN) under cold winter conditions. Both showed some removal of diclofenac, naproxen, clarithromycin, metoprolol, and trimethoprim, likely by biotransformation. Average naproxen removal was 21% (2.53 × 103 ng L-1) in MCN and 64% (1.58 × 103 ng L-1) in LPFN. Atenolol was well-removed by SAGR, by 80% on average (range of 64%-94%). Clarithromycin, metoprol...
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Anderson JC, Jabari P, Parajas A, Loeb E, Luong KH, Vahedi A, Wong CS Tags: Chemosphere Source Type: research
Research on efficient denitrification system based on banana peel waste in sequencing batch reactors: Performance, microbial behavior and dissolved organic matter evolution.
Abstract Nitrate pollution presents a serious threat to the environment and public health. As an excellent heterotrophic denitrification carbon source, banana peel (a kind of agricultural waste) provides a feasible alternative to deal with the persistent high concentrations of nitrate pollution. Although the feasibility and economy of banana peel for denitrification have already been reported, the long-term stability and mechanism were still unclear. The coupling mechanism of organic matters and microorganism in the denitrification process was systematically investigated through a 17-cycle experiment. The results ...
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Wang H, Chen N, Feng C, Deng Y, Gao Y Tags: Chemosphere Source Type: research
Adsorption kinetics of synthetic organic contaminants onto superfine powdered activated carbon.
In this study, the S-PACs and their parent PACs were tested for the adsorption of three aromatic compounds-2-phenylphenol, biphenyl, and phenanthrene-with and without the presence of natural organic matter (NOM). Adsorption rates were increased for adsorption onto S-PAC as compared to PAC in all trials without NOM and in most trials with NOM. Faster adsorption onto S-PAC was found to be a result of a smaller particle size, lower surface oxygen content, larger pore diameters, and neutral pHPZC. Adsorption of a planar compound, phenanthrene, increased the most between PAC and S-PAC, while adsorption of 2-phenylphenol, a nonp...
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Partlan E, Ren Y, Apul OG, Ladner DA, Karanfil T Tags: Chemosphere Source Type: research
Dynamic performance of a fungal biofilter packed with perlite for the abatement of hexane polluted gas streams using SIFT-MS and packing characterization with advanced X-ray spectroscopy.
Abstract The use of Fusarium solani fungi in an expanded perlite packed biofilter was investigated for the treatment of a hexane polluted waste gas stream using selected ion flow tube mass spectrometry (SIFT-MS). The latter analytical technique proved to be of utmost importance to evaluate the performance of the biofilter at high time resolution (seconds) under various transient conditions, analogous to industrial situations. The biofilter was operational for 277 days with inlet loads varying between 1 and 14 g m-3 h-1 and applying an empty bed residence time of 116 s. The results showed a positive ...
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Bruneel J, Huepe Follert JL, Laforce B, Vincze L, Van Langenhove H, Walgraeve C Tags: Chemosphere Source Type: research
Heterologous expression and functional study of nitric oxide reductase catalytic reduction peptide from Achromobacter denitrificans strain TB.
Abstract Biological denitrification is a promising and green technology for air pollution control. To investigate the nitric oxide reductase (NOR) that dominates NO reduction efficiency in biological purification, the heterologous prokaryotic expression system of the norB gene, which encodes the core peptide of the catalytic reduction structure in the NOR from Achromobacter denitrificans strain TB, was constructed in Escherichia coli BL21 (DE3). Results showed that the 1218 bp-long norB gene was expressed at the highest level under 1.0 mM IPTG for 5 h at 30 °C, and the relative expression a...
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Chen C, Wang Y, Liu H, Chen Y, Yao J, Chen J, Hrynsphanb D, Tatsianab S Tags: Chemosphere Source Type: research
Adsorption behavior and mechanism of Au(III) on caffeic acid functionalized viscose staple fibers.
Abstract A novel fibrous adsorbent (DAVSF-CA) was synthesized via grafting caffeic acid (CA) onto dialdehyde viscose staple fiber (DAVSF), and used to selectively adsorb Au(III) from simulated wastewater. Fourier Transform Infrared (FTIR), X-ray Photoelectron (XPS) and Nuclear Magnetic Resonance (NMR) spectra confirmed that caffeic acid was successfully grafted on DAVSF through condensation reaction. Adsorption experiments revealed that the adsorption of Au(III) on DAVSF-CA was extremely dependent on pH values and temperatures, and the maximum adsorption capacity of 3.71 mmol/g for Au(III) was obtained at pH&...
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Liu F, Zhou L, Tao L, Qian L, Yu G, Deng S Tags: Chemosphere Source Type: research
Transforming polystyrene waste into 3D hierarchically porous carbon for high-performance supercapacitors.
Abstract Polystyrene (PS) is usually discarded as a solid waste after a short lifespan. Thus the disposal of waste PS is an inevitably worldwide issue because of their stable and non-biodegradable nature. Herein, a facile method was proposed to carbonize PS waste into novel three-dimensional (3D) hierarchically porous carbon using Fe2O3 particles as both catalyst and template. Furthermore, KOH activation was applied to generate microporous and mesopores on the wall of macropores. As a result, the obtained 3D hierarchically porous carbon exhibits a high specific capacitance of 284.1 F g-1 at 0.5 A&nb...
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Ma C, Min J, Gong J, Liu X, Mu X, Chen X, Tang T Tags: Chemosphere Source Type: research
Analysis of power from palm oil solid waste for biomass power plants: A case study in Aceh Province.
Abstract Nowadays, the solid waste produced from palm oil has become one of the essential oils in the world in general and especially in Indonesia. Biomass waste is processed through substantial quantities of palm oil extraction. With the reduction in fossil fuels in recent years, it has had an impact on the deterioration of electricity supply at the National and International levels. Biomass is a renewable energy that can replace conventional energy. Besides, power generation from biomass is environmentally friendly and sustainable. This simulation was conducted to analyze the maximum power from the burning of oi...
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Mahidin, Saifullah, Erdiwansyah, Hamdani, Hisbullah, Hayati AP, Zhafran M, Sidiq MA, Rinaldi A, Fitria B, Tarisma R, Bindar Y Tags: Chemosphere Source Type: research
Nucleation mechanisms of iodic acid in clean and polluted coastal regions.
Abstract In coastal regions, intense bursts of particles are frequently observed with high concentrations of iodine species, especially iodic acid (IA). However, the nucleation mechanisms of IA, especially in polluted environments with high concentrations of sulfuric acid (SA) and ammonia (A), remain to be fully established. By quantum chemical calculations and atmospheric cluster dynamics code (ACDC) simulations, the self-nucleation of IA in clean coastal regions and that influenced by SA and A in polluted coastal regions are investigated. The results indicate that IA can form stable clusters stabilized by haloge...
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Rong H, Liu J, Zhang Y, Du L, Zhang X, Li Z Tags: Chemosphere Source Type: research
Perfluoroalkyl substances cause Leydig cell dysfunction as endocrine disruptors.
Abstract Perfluoroalkyl substances (PFASs) are a group of man-made organic substances. Some of PFASs have been classified as persistent organic pollutants and endocrine disruptors. They might interfere with the male sex endocrine system, causing the abnormal development of the male reproductive tract and failure of pubertal onset and infertility. The present review discusses the development and function of two generations of Leydig cells in rodents and the effects of PFASs on Leydig cell development after their exposure in gestational and postnatal periods. We also discuss human epidemiological data for the effect...
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Zhu Q, Li H, Wen Z, Wang Y, Li X, Huang T, Mo J, Wu Y, Zhong Y, Ge RS Tags: Chemosphere Source Type: research
Association of internal exposure to polycyclic aromatic hydrocarbons with inflammation and oxidative stress in prediabetic and healthy individuals.
This study revealed the association between PAH exposure and markers of inflammation and oxidative stress, and the enhanced responses of pre-T2D patients suggested that individuals with metabolic disorders were more susceptible to the adverse health effects of PAH exposure. PMID: 32464779 [PubMed - in process] (Source: Chemosphere)
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Zhang H, Han Y, Qiu X, Wang Y, Li W, Liu J, Chen X, Li R, Xu F, Chen W, Yang Q, Fang Y, Fan Y, Wang J, Zhang H, Zhu T Tags: Chemosphere Source Type: research
Polybrominated Diphenyl Ether and Organophosphate Flame Retardants in Canadian Fire Station Dust.
Abstract Fire fighters are at a high risk for exposure to toxic chemicals during and subsequent to fire suppression activities. In the Canadian Fire Station Dust Study (CFSDS) we measured 19 polybrominated diphenyl ether (PBDE) and six organophosphate flame retardant (OPFR) chemicals in dust collected in 2017-18 by vacuuming the living quarters of 24 Canadian fire stations from four provinces. The predominant flame retardant (FR) was BDE-209, with a median concentration of 7060 ng/g, which was a magnitude higher than medians of the major congeners of the pentaBDE formulation measured at 620 ng/g (Σ...
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Gill R, Hurley S, Brown R, Tarrant D, Dhaliwal J, Sarala R, Park JS, Patton S, Petreas M Tags: Chemosphere Source Type: research
The effect of graphene oxide on signalling of xenobiotic receptors involved in biotransformation.
In conclusion, GO decreases ligand-stimulated activities of AhR and PXR in human cells. PMID: 32464781 [PubMed - in process] (Source: Chemosphere)
Source: Chemosphere - May 30, 2020 Category: Chemistry Authors: Ženata O, Vrzalová A, Bachleda P, Janečková J, Panáček A, Kvítek L, Vrzal R Tags: Chemosphere Source Type: research
Coagulation of organo-mineral colloids and formation of low molecular weight organic and metal complexes in boreal humic river water under UV-irradiation.
Abstract Photodegradation of dissolved organic matter (DOM) is highly important in humic waters of peatland regions, yet the coupling between organic and organo-mineral colloids, trace metals and bioavailability of photodegraded products is poorly known. Here we studied photo-destruction of organo-mineral colloids induced by UV-irradiation of sterile-filtered mire water. We revealed two simultaneously occurring processes of transformation of DOM and trace elements speciation: (i) disintegration of high molecular weight organo-mineral colloids into lower molecular weight (0.22 μm) aggregates of metals and o...
Source: Chemosphere - May 29, 2020 Category: Chemistry Authors: Drozdova OY, Aleshina AR, Tikhonov VV, Lapitskiy SA, Pokrovsky OS Tags: Chemosphere Source Type: research
Fenton reaction induced in-situ redox and re-complexation of polyphenol-Cr complex and their products.
In this study, in-situ Fenton oxidation was used for the de-complexation and degradation of tannin-Cr(III) complexes. Cr(III) can be oxidized into free Cr(VI) under the effect of ·OH and oxidation products of tannin can be used as reductant for Cr(VI) to establish a redox cycle of Cr(III)-Cr(VI)-Cr(III). Thus, it is crucial to investigate the interactions of Cr(III) with tannin derived oxidation products due to negligible accumulation of Cr(VI) during Fenton oxidation treatment. Here, sequential filtration/ultrafiltration was applied to reveal the distribution characteristics of TOC and Cr fractions during the oxida...
Source: Chemosphere - May 29, 2020 Category: Chemistry Authors: Ma H, Wang Q, Hao Y, Zhu C, Chen X, Wang C, Yang Y Tags: Chemosphere Source Type: research
Chromium resistant microbes and melatonin reduced Cr uptake and toxicity, improved physio-biochemical traits and yield of wheat in contaminated soil.
Abstract Melatonin and metal resistant microbes can enhance plant defense responses against various abiotic stresses, but little is known about the combined effects of melatonin and chromium (Cr) resistant microbes on reducing Cr toxicity in wheat (Triticum aestivum L.). In current study, we examined the effects of combined application of melatonin (0, 1, 2 mM) and Bacillus subtilis (with and without inoculation) on wheat physio-biochemical responses and Cr uptake under different levels of Cr (0, 25, 50 and 100 mg Cr kg-1 DM soil). Chromium stress decreased the wheat growth, biomass, chlorophyll and rela...
Source: Chemosphere - May 29, 2020 Category: Chemistry Authors: Seleiman MF, Ali S, Refay Y, Rizwan M, Alhammad BA, El-Hendawy SE Tags: Chemosphere Source Type: research
Uranium (234U, 238U) and thorium (230Th, 232Th) in mushrooms of genus Leccinum and Leccinellum and the potential effective ionizing radiation dose assessment for human.
Abstract Evaluated has been bioconcentration potential by fungi and risk to human consumers from exposure to natural long-lived radioactive uranium (234U, 238U) and thorium (230Th, 232Th) sequestered in stems, caps and the whole fruiting bodies by mushrooms of the genus Leccinum and Leccinellum. Edible species in the study were collected from boreal forests in the northern regions of Poland and investigated: red-capped scaber (Leccinum aurantiacum), orange oak bolete (Leccinum aurantiacum var. quercinum), foxy bolete (Leccinum vulpinum), slate bolete (Leccinum aurantiacum var. duriusculum) and hazel bolete (Leccin...
Source: Chemosphere - May 29, 2020 Category: Chemistry Authors: Szymańska K, Strumińska-Parulska D, Falandysz J Tags: Chemosphere Source Type: research
The tale of a versatile enzyme: Alpha-amylase evolution, structure, and potential biotechnological applications for the bioremediation of n-alkanes.
es BC Abstract As the primary source of a wide range of industrial products, the study of petroleum-derived compounds is of pivotal importance. However, the process of oil extraction and refinement is among the most environmentally hazardous practices, impacting almost all levels of the ecological chain. So far, the most appropriate strategy to overcome such an issue is through bioremediation, which revolves around the employment of different microorganisms to degrade hazardous compounds, generating less environmental impact and lower monetary costs. In this sense, a myriad of organisms and enzymes are considered ...
Source: Chemosphere - May 29, 2020 Category: Chemistry Authors: Pinto ÉSM, Dorn M, Feltes BC Tags: Chemosphere Source Type: research
Biodegradation of slop oil by endophytic Bacillus cereus EN18 coupled with lipase from Rhizomucor miehei (Palatase ®).
Biodegradation of slop oil by endophytic Bacillus cereus EN18 coupled with lipase from Rhizomucor miehei (Palatase®). Chemosphere. 2020 Jul;250:126203 Authors: Marchut-Mikolajczyk O, Drożdżyński P, Struszczyk-Świta K Abstract Removal of slop oil, a by-product of oil refining, also obtained in cleaning up of oil tanks and filters is a difficult issue. High content of hydrocarbons (C3-C40) and other organic compounds makes this waste difficult to eliminate from the environment. The purpose of this investigation was to combine bacterial degradation by endophytic Bacillus cereus EN18 with biotrans...
Source: Chemosphere - May 29, 2020 Category: Chemistry Authors: Marchut-Mikolajczyk O, Drożdżyński P, Struszczyk-Świta K Tags: Chemosphere Source Type: research
Combined effects of soil particle size with washing time and soil-to-water ratio on removal of total petroleum hydrocarbon from fuel contaminated soil.
This study suggests a threshold washing time of 1 h and a threshold soil-to-water ratio of 1:6 for the whole soil in soil washing. However, soil particles less than 0.075 mm (
Source: Chemosphere - May 29, 2020 Category: Chemistry Authors: Gautam P, Bajagain R, Jeong SW Tags: Chemosphere Source Type: research
Comprehensive systematic review and meta-analysis of dyes adsorption by carbon-based adsorbent materials: Classification and analysis of last decade studies.
Abstract Carbon-based materials and their modifications have received significant attention over the last decades given the outstanding adsorption behavior toward various dyes from aqueous solutions. In this systematic review and meta-analysis, the adsorption capability of dyes on carbon-based adsorbent materials (CBAMs) has been compiled. Further, the effects of process variables i.e., pH, adsorbent dosage, contact time, and initial concentration), adsorption kinetics, and isotherms were investigated while considering the classification of different groups of dyes and adsorbents. The Metafor package provides func...
Source: Chemosphere - May 29, 2020 Category: Chemistry Authors: Azari A, Nabizadeh R, Nasseri S, Mahvi AH, Mesdaghinia AR Tags: Chemosphere Source Type: research
Effluent recirculation enables near-complete oxidation of organics during supercritical water oxidation at mild conditions: A proof of principle.
Abstract This work presents a continuous set-up for SCWO, which was operated at mild conditions (380 °C, 25 MPa, oxidant equivalence ratio of 2.0 and residence time of 26 s) to oxidize cellulose, lignin, and acetic acid as model compounds. The aim was to oxidize different organics consecutively to near completion in the same mild reaction conditions and set-up. These conditions can overcome some drawbacks associated to SCWO. To combine near complete oxidation with the applied mild process conditions, aqueous effluent from SCWO, containing intermediates from incomplete oxidation, was recycled for...
Source: Chemosphere - May 29, 2020 Category: Chemistry Authors: Zhang D, Ghysels S, Ronsse F Tags: Chemosphere Source Type: research
Negative effects of a piscicide, rotenone, on the growth and metabolism of three submerged macophytes.
Abstract A piscicide, rotenone (RT), is frequently used for clear and management of aquatic systems such as fish pond, and even for illegal fishing throughout the world. The effects of RT on submerged macrophytes remain elusive although the effects of RT on many kinds of animals are well documented. We wanted to determine the effects of RT on the growth and metabolism of three submerged plants (Vallisneria natans, Myriophyllum spicatum, Potamogeton maackianus) and try to find the reasons of these effects. The results showed that the shoot height, shoot dry weight, root dry weight, root:shoot ratios, contents of so...
Source: Chemosphere - May 29, 2020 Category: Chemistry Authors: Wu AP, He Y, Ye SY, Qi LY, Liu L, Zhong W, Wang YH, Fu H Tags: Chemosphere Source Type: research
Application of metallic nanoparticle-biochars with ionic liquids for thermal transfer fluids.
Abstract Ionic liquids (ILs (1-butyl-3-methylimidazolium chloride ([C4mim][Cl]) and 1-butyl-3-methylimidazolium tetrafluoroborate ([C4mim][BF4]))) were used as heat transfer fluids for solar thermal collectors. The additive of ILs was biochar containing copper and silver nanoparticles (Cu-Ag/biochar) to improve the adsorption of solar irradiation and thermal conductivities. After impregnation and reduction processes, nanoparticles such as Cu, CuO, Cu(OH)2, Ag, and Ag2O were found in the biochar by X-ray powder diffraction (XRD) spectroscopy. With adding 2% Cu-Ag/biochar into the ILs, the thermal conductivities of ...
Source: Chemosphere - May 29, 2020 Category: Chemistry Authors: Huang HL, Huang ZH, Chu YC, Lin HP, Chang YJ Tags: Chemosphere Source Type: research
How does continuous venovenous hemofiltration theoretically expose (ex-vivo models) inpatients to diethylhexyladipate, a plasticizer of PVC medical devices?
In this study, 2 CVVH models were used to evaluate the potential migration of DEHA from PVC tubings, allowing the determination of (Rachoin and Weisberg, 2019) the highest rates of DEHA able to migrate into a simulant flowing in a marketed adult CVVH circuit by disregarding any metabolisation and (Krieter et al., 2013) the clinical-reflecting exposure of patients to this plasticizer and its metabolites by assessing their migration into blood. In the first model, we showed that patients undergoing a CVVH procedure may be exposed to high rates of DEHA. Moreover, DEHA is continuously hydrolyzed into its primary metabolit...
Source: Chemosphere - May 29, 2020 Category: Chemistry Authors: Bernard L, Bailleau M, Eljezi T, Chennell P, Souweine B, Lautrette A, Sautou V Tags: Chemosphere Source Type: research
Application of a multiple lines of evidence approach to document natural attenuation of hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) in groundwater.
This study utilized innovative analyses to develop multiple lines of evidence for natural attenuation of hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) in groundwater at the U.S. Department of Energy's Pantex Plant. RDX, as well as the degradation product 4-nitro-2,4-diazabutanal (NDAB; produced by aerobic biodegradation or alkaline hydrolysis) were detected in a large portion of the plume, with lower concentrations of the nitroso-containing metabolites produced during anaerobic biodegradation. 16S metagenomic sequencing detected the presence of bacteria known to aerobically degrade RDX (e.g., Gordonia, Rhodococcus) and NDA...
Source: Chemosphere - May 29, 2020 Category: Chemistry Authors: Fuller ME, Koster van Groos PG, Jarrett M, Kucharzyk KH, Minard-Smith A, Heraty LJ, Sturchio NC Tags: Chemosphere Source Type: research
Differences in elemental composition of tailings, soils, and plant tissues following five decades of native plant colonization on a gold mine site in Northwestern Qu ébec.
This study sheds light on the plasticity of alder, spruce and birch growing on mine sites, allowing us to better understand elemental dynamics on such sites, and ultimately improve their management. PMID: 32109699 [PubMed - indexed for MEDLINE] (Source: Chemosphere)
Source: Chemosphere - May 29, 2020 Category: Chemistry Authors: Gagnon V, Rodrigue-Morin M, Tardif A, Beaudin J, Greer CW, Shipley B, Bellenger JP, Roy S Tags: Chemosphere Source Type: research
Polybrominated diphenyl ethers in foods from the Region of Valencia: Dietary exposure and risk assessment.
F, Yusà V Abstract Dietary exposure to polybrominated diphenyl ethers (PBDEs) of the population in the Region of Valencia, Spain, was assessed. A group of 320 composite samples of different fatty foods was collected and analyzed, including the following: vegetable oils, and foods of animal origin such as (a) fish and seafood, (b) eggs, (c) milk and dairy products, and (d) meat and meat products. Two scenarios were assumed for left-censored results: lower-bound (LB) and upper-bound (UB). Vegetable oils, and fish and seafood presented the highest content of PBDEs [mean values of 503 and 464 pg g-1 ...
Source: Chemosphere - May 29, 2020 Category: Chemistry Authors: Pardo O, Fernández SF, Quijano L, Marín S, Villalba P, Corpas-Burgos F, Yusà V Tags: Chemosphere Source Type: research
Low permeability zone remediation of trichloroethene via coupling electrokinetic migration with in situ electrochemical hydrodechlorination.
Abstract To address the challenge of trichloroethene (TCE) remediation in low permeability zone, an inexpensive Cu-Ni bimetallic cathode was proposed in electrokinetic (EK) remediation system to couple electrokinetic migration with in situ electrochemical hydrodechlorination. Aqueous phase TCE was originally added into the anolyte so that breakthrough curves through the low permeability porous soil compartment could be obtained to better understand TCE migration driven by electroosmosis flow using different cathodes. The Cu-Ni cathode resulted in more TCE migration of 7.64 mg compared to that of 5.99 mg ...
Source: Chemosphere - May 29, 2020 Category: Chemistry Authors: Liu B, Li G, Mumford KG, Kueper BH, Zhang F Tags: Chemosphere Source Type: research
The remarkable effect of alkali earth metal ion on the catalytic activity of OMS-2 for benzene oxidation.
Abstract Cryptomelane-type octahedral molecular sieve (OMS-2) is one of the most promising catalysts for VOCs oxidation, and introduction of metal ions in OMS-2 tunnel is widely used for tailoring its catalytic activity. Here, different types of alkali earth metal ions with the same X/Mn atomic ratio of approximately 0.012 (X represents Mg2+, Ca2+, and Sr2+) were successfully introduced into OMS-2 tunnel by a one-step redox reaction. The catalytic test showed that introducing alkali earth metal ions into tunnels had a considerable effect on the catalytic performance of OMS-2 for benzene oxidation. The Sr2+ doped O...
Source: Chemosphere - May 29, 2020 Category: Chemistry Authors: Ni C, Hou J, Li L, Li Y, Wang M, Yin H, Tan W Tags: Chemosphere Source Type: research
Effect of gestational and lactational nonylphenol exposure on airway inflammation in ovalbumin-induced asthmatic rat pups.
Abstract To investigate the effect of gestational and lactational nonylphenol (NP) exposure on airway inflammation in ovalbumin (OVA)-induced asthmatic pups. Dams were gavaged with NP at dose levels of 25 mg/kg/day (low dose), 50 mg/kg/day (middle dose), 100 mg/kg/day (high dose) and groundnut oil alone (vehicle control) respectively from gestational day 7 to postnatal day 21. The results showed that the NP content in the lung tissues of pups in the 100 mg/kg NP group was significantly higher than that of the control group (P = 0.004). In the 100 mg/kg NP group, the infiltration ...
Source: Chemosphere - May 29, 2020 Category: Chemistry Authors: Yu J, Tuo F, Luo Y, Xu J Tags: Chemosphere Source Type: research
Impact of Fe, Mn co-doping in titanate nanowires photocatalytic performance for emergent organic pollutants removal.
Monteiro OC Abstract The unexpected incorporation of ionic Mn and Fe in the crystalline structure of titanate nanowires was accomplished when a contaminated a titanium source was used. The presence of Mn (8.1 mg L-1) and Fe (4.3 mg L-1) result in the production of a novel co-doped (Fe,Mn) titanate nanowires (TNW) material with improved optical and photocatalytic properties. After structural characterization, the results indicate that both Mn and Fe were incorporated in the TNW structure by replacement of Na+ in the interlayers, together with Ti4+ substitution in the TiO6 octahedra. The potentia...
Source: Chemosphere - May 29, 2020 Category: Chemistry Authors: Barrocas B, Chiavassa LD, Conceição Oliveira M, Monteiro OC Tags: Chemosphere Source Type: research
Carbonation based leaching assessment of recycled concrete aggregates.
Abstract The leaching characteristics of seven different recycled concrete aggregates (RCA) samples derived from building demolition waste, concrete pavement, stockpiled, and freshly crushed concrete were evaluated focusing on the effects of carbonation, liquid-to-solid ratio (L/S), and particle sizes. Batch water leach test (WLT), toxicity characteristic leaching procedure (TCLP), and synthetic precipitation leaching procedure (SPLP) were performed to assess the pH, electrical conductivity (EC), alkalinity, and the leached concentrations of Ba, Ca, Cr, Mg, and SO4 in RCA effluent. The leaching efficiency of the t...
Source: Chemosphere - May 29, 2020 Category: Chemistry Authors: Mahedi M, Cetin B Tags: Chemosphere Source Type: research
Development of a solid-phase microextraction method for fast analysis of cyclic volatile methylsiloxanes in water.
Abstract Cyclic volatile methylsiloxanes (cVMS) are widely used in consumer products and commonly detected in the environment. There are challenges in the analysis of cVMS because of their ubiquitous use which can introduce high background contamination. The current study introduces a sample preparation method based on headspace of solid-phase microextraction (SPME) for monitoring the cVMS in waters. Efforts were made to reduce the background contamination during sample preparation and instrument analysis. A laboratory prepared MIL-101 coating was prepared using polysulfone instead of polydimethylsiloxane as adhes...
Source: Chemosphere - May 29, 2020 Category: Chemistry Authors: Zhang L, Jiang R, Li W, Muir DCG, Zeng EY Tags: Chemosphere Source Type: research
The effect of bioaugmentation with Exiguobacterium sp. AO-11 on crude oil removal and the bacterial community in sediment microcosms, and the development of a liquid ready-to-use inoculum.
This study demonstrates the feasibility of using Exiguobacterium sp. AO-11 to remediate oil-contaminated environments. Bioaugmentation using AO-11 showed the best removal percentage, 75%, of 4% (w/w) crude oil in sediment microcosms in 100 days. In terms of the bacterial community structure during crude oil degradation, the addition of AO-11 did not change the indigenous bacterial community, while the addition of urea fertilizer induced structural shift of indigenous bacterial community. Exiguobacterium sp. AO-11 was developed as a bioremediation product, and a liquid formulation of AO-11 was developed. Coconut milk residu...
Source: Chemosphere - May 29, 2020 Category: Chemistry Authors: Muangchinda C, Srisuwankarn P, Boubpha S, Chavanich S, Pinyakong O Tags: Chemosphere Source Type: research