Corrosion of upstream metal plumbing components impact downstream PEX pipe surface deposits and degradation.
This study highlights potential downstream plastic pipe degradation and metal deposition, which may cause plumbing problems and failures for building owners, inhabitants, and water utilities. PMID: 31310967 [PubMed - as supplied by publisher] (Source: Chemosphere)
Source: Chemosphere - July 10, 2019 Category: Chemistry Authors: Huang X, Pieper KJ, Cooper HK, Diaz-Amaya S, Zemlyanov DY, Whelton AJ Tags: Chemosphere Source Type: research
Analysis and occurrence of benzotriazole ultraviolet stabilisers in different species of seaweed.
dríguez JJ Abstract Benzotriazole ultraviolet stabilisers (BUVSs) are emerging compounds used in personal care products and in other products, such as plastics, to absorb UV light. BUVSs have been described as bioaccumulative, persistent and toxic, so it is of great interest to understand their presence in the environment. Some marine organisms, such as seaweeds, have been used as bioindicators of contamination in the environment because they are able to accumulate metals and organic compounds. We have selected seaweeds to develop a novel method to extract, identify and determine six BUVSs (UV P, UV 326, UV...
Source: Chemosphere - July 10, 2019 Category: Chemistry Authors: Pacheco-Juárez J, Montesdeoca-Esponda S, Torres-Padrón ME, Sosa-Ferrera Z, Santana-Rodríguez JJ Tags: Chemosphere Source Type: research
Copper phytoavailability in vineyard topsoils as affected by pyoverdine supply.
This study investigated the extent to which the mobility and the phytoavailability of Cu varied among vineyard soils with different pH and how they were affected by a supply of Pvd. Pvd was supplied (or not) to ten vineyard topsoils with pH ranging from 5.9 to 8.6 before metal was extracted with 0.005 M CaCl2. Cu mobility was assessed through its total concentration and Cu phytoavailability through its free ionic concentration measured in the CaCl2 extract. Cu mobility varied by a factor of six and Cu phytoavailability by a factor of 5000 among the soil samples. In the CaCl2 extract, the concentration of Cu2+ was not cor...
Source: Chemosphere - July 10, 2019 Category: Chemistry Authors: Cornu JY, Randriamamonjy S, Gutierrez M, Rocco K, Gaudin P, Ouerdane L, Lebeau T Tags: Chemosphere Source Type: research
Accumulation of different shapes of microplastics initiates intestinal injury and gut microbiota dysbiosis in the gut of zebrafish.
Abstract Different shapes of microplastics are widely detected in the environment and organisms and most of them remain in the gut. However, the influences of shapes on the bioaccumulation and toxicity of microplastics in the gut are largely unknown. Three shapes (bead, fragment, and fiber) of microplastics of comparable size in one dimension were prepared to exposure to zebrafish. The accumulation and toxicities of microplastics in the gut were detected. Shape-dependent accumulation in the gut was observed with the order of fibers (8.0 μg/mg) > fragments (1.7 μg/mg) > beads (0.5 μg/mg...
Source: Chemosphere - July 10, 2019 Category: Chemistry Authors: Qiao R, Deng Y, Zhang S, Wolosker MB, Zhu Q, Ren H, Zhang Y Tags: Chemosphere Source Type: research
Growth, DNA damage and biochemical toxicity of cyantraniliprole in earthworms (Eisenia fetida).
Abstract Cyantraniliprole is a second-generation diamide insecticide that exhibited excellent biological efficacy against a variety of pests. To assess the toxic impact of cyantraniliprole on earthworms, the levels of reactive oxygen species (ROS) and malondialdehyde (MDA), activities of superoxide dismutase (SOD), catalase (CAT) and glutathione S-transferase (GST), as well as DNA damage were measured after exposed to five cyantraniliprole concentrations ranging from 0 to 10.00 mg/kg for 7, 14, 21 and 28 days. In most treatment groups, the ROS levels increased significantly before exposure time of 14 days and th...
Source: Chemosphere - July 9, 2019 Category: Chemistry Authors: Qiao Z, Zhang F, Yao X, Yu H, Sun S, Li X, Zhang J, Jiang X Tags: Chemosphere Source Type: research
Single and joint effects of chronic exposure to chlorpyrifos and glyphosate based pesticides on structural biomarkers in Cnesterodon decemmaculatus.
Abstract Worldwide freshwater bodies that cross agricultural or urban areas are exposed to mixtures of xenobiotics. In particular, pesticides are usually part of these mixtures and could come into direct or indirect contact with biota and therefore, organisms have to cope with this altered scenario and the detrimental effects of these substances. Commercial formulations of chlorpyrifos and glyphosate, and their mixtures were evaluated using a set of biomarkers in the native fish C. decemmaculatus exposed to relevant environmentally pesticides concentrations. The biomarkers measured were: histopathological ind...
Source: Chemosphere - July 9, 2019 Category: Chemistry Authors: Bonifacio AF, Hued AC Tags: Chemosphere Source Type: research
Evaluating phytotoxicity of bare and starch-stabilized zero-valent iron nanoparticles in mung bean.
In conclusion, B-nZVI easily aggregate into larger particles in solution, leading to decreased adhesion to root surface and lower uptake by roots, whereas the higher dispersity and hydrophilicity of S-nZVI makes them more readily be adhered to root surface forming a coating, and penetrated into roots, resulting in excess Fe accumulation, consequently interfering with root functions such as the adsorption and transport of water and nutrients. PMID: 31310976 [PubMed - as supplied by publisher] (Source: Chemosphere)
Source: Chemosphere - July 9, 2019 Category: Chemistry Authors: Sun Y, Jing R, Zheng F, Zhang S, Jiao W, Wang F Tags: Chemosphere Source Type: research
Characterization of the chemical activity of a pulsed corona discharge above water.
Abstract A pulsed corona discharge above liquid combined with ozonation has been investigated for the degradation of organic pollutants in water, as well as regarding the generation of several oxidizing species: ozone in gas phase, hydrogen peroxide and hydroxyl radicals in the liquid. A considerable improvement in the energy efficiency for organic compounds removal has been observed when reducing the width of the discharge pulses. This finding was correlated with the efficient formation of oxidizing species in case of short pulses. Recycling of the effluent gas from the plasma also enhances contaminants degradati...
Source: Chemosphere - July 9, 2019 Category: Chemistry Authors: Bilea F, Bradu C, Mandache NB, Magureanu M Tags: Chemosphere Source Type: research
Candidates of quorum sensing bacteria in activated sludge associated with N-acyl homoserine lactones.
This study aimed to explore candidates of microbial groups which is associated with quorum sensing in activated sludge. Activated sludge samples were collected from three wastewater treatment plants (WWTP) to analyze N-acyl homoserine lactone (AHL) by Fourier-transform mass spectrometry (FTMS) and 16S rRNA-based microbial community. Among activated sludge samples taken at 3 WWTPs in different seasons, 2 AHL species of N-3-hydroxyoctanoyl-l-homoserine lactone and N-3-hydroxydecanoyl-l-homoserine lactone were detected in the range of ranged of 0.1 ng/L to 1.6 ng/L. The detected AHL species were not dependent on treatment...
Source: Chemosphere - July 8, 2019 Category: Chemistry Authors: Panchavinin S, Tobino T, Hara-Yamamura H, Matsuura N, Honda R Tags: Chemosphere Source Type: research
Protective effect of p53 knockout on 4-nonylphenol-induced nephrotoxicity in medaka (Oryzias latipes).
Abstract In the past few decades, environmental pollutants have become common because of misused nonionic surfactants and detergents. Nonylphenol ethoxylates (NPs) are one of the most important contaminants of water. Therefore, the present study aimed to investigate the protective blocking effect of apoptosis (deficient P53 gene) on 4-nonylphenol (4-NP)-induced nephrotoxicity of medaka (Oryzias latipes). We divided 36 fish into six groups: two different control groups of wild type (Wt; Hd-rR) control and p53 (-/-) control, and four different treated with 4-nonylphenol (50 μg/L and 100 μg/L) for 15 days. ...
Source: Chemosphere - July 8, 2019 Category: Chemistry Authors: Sayed AEH, Kotb AM, Oda S, Kashiwada S, Mitani H Tags: Chemosphere Source Type: research
Nitrogen form regulates cadmium uptake and accumulation in Tanzania guinea grass used for phytoextraction.
The objective was to evaluate the response of Panicum maximum cv. Tanzania to NO3-/NH4+ ratios and Cd levels. A 3 × 3 factorial experiment was conducted under greenhouse conditions, in a randomized complete block design replicated three times, with three NO3-/NH4+ ratios (100/0, 70/30 and 50/50) and three Cd levels (0.0, 0.5 and 1.0 mM). Although it increased plant total nitrogen concentration, Cd exposure reduced shoot and root growth. Moreover, it altered nitrogen metabolism and induced the accumulation of NO3- and NH4+ mainly in shoots. The supply of 50/50 disturbed glutamine synthetase activity and changed ...
Source: Chemosphere - July 8, 2019 Category: Chemistry Authors: de Sousa Leite T, Monteiro FA Tags: Chemosphere Source Type: research
Analysis of mass transfer behavior in membrane distillation: Mathematical modeling under various conditions.
Abstract Four commercially available hydrophobic membranes with different pore sizes were separately used in a direct contact membrane distillation (DCMD) apparatus to investigate the effect of fouling on the mass transfer coefficient, and the dominant mass transport mode under different conditions defined by the temperature, membrane material, flow regime, and membrane pore size. Both ultrapure deionized water and simulated industrial wastewater were considered as the feed water. The results of the investigation confirmed that the fouling layer impacted the mass transport directly by resisting it, and indirectly ...
Source: Chemosphere - July 8, 2019 Category: Chemistry Authors: Damtie MM, Woo YC, Kim B, Park KD, Hailemariam RH, Shon HK, Choi JS Tags: Chemosphere Source Type: research
Tracing groundwater salinization using geochemical and isotopic signature in Southeastern coastal Tamilnadu, India.
Abstract Attempt has been made to discriminate groundwater salinity causes along the east coast of India. A total of 122 groundwater samples (61/season) were collected for two diverse seasons (Pre Monsoon and Post Monsoon) and analyzed for physical and chemical components along with stable isotopes. The Piper diagram proposes samples along the coast predisposed by saltwater incursion. Ionic ratio plots recommend groundwater discriminatory by changing geochemical signatures. The statistical correlation suggests impact of saltwater incursion, anthropogenic and rock water interaction as sources for dissolved constitu...
Source: Chemosphere - July 7, 2019 Category: Chemistry Authors: Gopinath S, Srinivasamoorthy K, Saravanan K, Prakash R Tags: Chemosphere Source Type: research
Environmental risk related to presence and mobility of As, Cd and Tl in soils in the vicinity of a metallurgical plant - Long-term observations.
Abstract Analysis of the content of As, Cd and Tl accompanying Zn-Pb ores was performed using soil material sampled around the zinc-works in Miasteczko Śląskie. It was found that the total content of As, Cd and Tl was considerably higher than the values recorded at the same sites 20 years earlier. This clearly confirms considerable pollution of the environment which continues despite pro-ecological actions taken by the zinc-works. The analysis of the spatial distribution of pollution revealed that the zinc-works itself is no longer the main source of contamination as was the case in 1998. Instead, in 2018 the ma...
Source: Chemosphere - July 6, 2019 Category: Chemistry Authors: Kicińska A Tags: Chemosphere Source Type: research
Removal kinetics of petroleum hydrocarbons from low-permeable soil by sand mixing and thermal enhancement of soil vapor extraction.
Abstract Thermally enhanced remediation of n-alkanes-contaminated silty soil mixed with coarse quartz sands was demonstrated in a laboratory cylindrical tank with diameter of 40 cm and depth of 30 cm. The removal kinetics of semi-volatile n-alkanes (C10, C11, C13-16) under three pulsed heating operations of soil vapor extraction (SVE) was investigated. CMG-STARS software was adopted to simulate the dynamics of heat transfer within the soil column. The results indicated the dramatic increase of air permeability of soil and acceleration of heat transfer after introduction of sand, with the result of achieving ra...
Source: Chemosphere - July 6, 2019 Category: Chemistry Authors: Yu Y, Liu L, Yang C, Kang W, Yan Z, Zhu Y, Wang J, Zhang H Tags: Chemosphere Source Type: research
Enhanced removal of pharmaceuticals in a biofilter: Effects of manipulating co-degradation by carbon feeding.
This study aimed at investigating the effects of pulsed carbon feeding for promoting the co-degradation of indigenous pharmaceuticals from pre-treated wastewater in a fixed-bed porous biofilm reactor (slow sand filter). The addition of acetate (carbon source) resulted in three different enhancement/limitation effects, which were compound dependent: 1) atenolol and iohexol experienced enhanced co-degradation followed by constant (acetate independent) degradation; 2) metoprolol, iomeprol, diclofenac, propranolol and sulfamethizole co-degradation dependent on aerobic turnover, but inhibited at higher acetate concentrations (6...
Source: Chemosphere - July 5, 2019 Category: Chemistry Authors: Zhang L, Carvalho PN, Bollmann UE, Ei-Taliawy H, Brix H, Bester K Tags: Chemosphere Source Type: research
Membrane-based technologies for zero liquid discharge and fluoride removal from industrial wastewater.
This study examined the hybrid crystallization-reverse osmosis technique (HRO) in light of flux, fluoride removal efficiency, fouling tendency, mineral recovery, complying zero liquid discharge (ZLD), and effluent discharge standard (EDS). Simulated wastewater with an IFC of 6600 mg/L was utilized and the final HRO performance was compared with those of the low-pressure (30 bar) standalone reverse osmosis (SRO), nanofiltration (SNF), and membrane distillation (SMD) processes. Accordingly, the study on SRO and SNF revealed that pressure, feed pH, membrane type, and IFC were the major factors affecting performance, and S...
Source: Chemosphere - July 5, 2019 Category: Chemistry Authors: Damtie MM, Hailemariam RH, Woo YC, Park KD, Choi JS Tags: Chemosphere Source Type: research
Metabolism and distribution of dibutyl phthalate in wheat grown on different soil types.
Abstract Herein, we investigated the distribution of dibutyl phthalate (DBP) in the tissues of wheat grown on DBP-contaminated soils and determined the activity of detoxifying enzymes [cytochrome P450 (P450) and glutathione S-transferase (GST)] in these tissues at different growth stages of wheat. The content of DBP in wheat grown on all soil types increased with increasing DBP stress concentration, and the DBP content of each tissue decreased as wheat growth progressed. Under the same conditions, the DBP content of roots exceeded that of leaves and stems, and the DBP content of all tissues decreased in the order ...
Source: Chemosphere - July 4, 2019 Category: Chemistry Authors: Gao M, Dong Y, Zhang Z, Song Z Tags: Chemosphere Source Type: research
Interactions between natural organic matter (NOM) and the cationic dye toluidine blue at varying pHs and ionic strengths: Effects of NOM charges and Donnan gel potentials.
This study examined effects of charges of molecules of natural organic matter (NOM) on its interactions with organic cations represented by toluidine blue (TB). NOM was exemplified in this study by Suwannee River (SR) and South Platte (SP) NOM. TB/NOM interactions were probed in the range of pH 3 to 11, DOC concentrations 0-10.6 mg L-1 and ionic strengths 0.001-0.1 mol L-1. Changes of TB absorbance at indicative wavelengths of 640 and 550 nm located in the characteristic absorbance band of TB and their ratio R640/550 were used to quantify TB/NOM binding and the formation of TB dimers and possibly higher order agg...
Source: Chemosphere - July 4, 2019 Category: Chemistry Authors: Xie X, Guo H, Yan M, Korshin G Tags: Chemosphere Source Type: research
Anaerobic methane oxidation coupled to sulfate reduction in a biotrickling filter: Reactor performance and microbial community analysis.
This study showed that the BTF is a suitable reactor configuration for the enrichment of microbial communities involved in AOM coupled to SR at ambient pressure and temperature with a relatively short start-up time. PMID: 31310977 [PubMed - as supplied by publisher] (Source: Chemosphere)
Source: Chemosphere - July 3, 2019 Category: Chemistry Authors: Cassarini C, Rene ER, Bhattarai S, Vogt C, Musat N, Lens PNL Tags: Chemosphere Source Type: research
Soil elemental concentrations, geoaccumulation index, non-carcinogenic and carcinogenic risks in functional areas of an informal e-waste recycling area in Accra, Ghana.
This study assesses the distribution, contamination and human health risks of major, minor and trace elements in the topsoil and subsoil of two informal e-waste recycling sites in Accra, Ghana. Metal concentrations in Agbogbloshie exceeded the Dutch Soil intervention values with exceedances of 72%, 57%, 57%, 38%, 16%, 2% for Cu, Zn, Pb, Ba, Cd and As respectively. Metal concentrations in Ashaiman exceeded the Dutch Soil intervention values with exceedances of 62%, 57% and 46% for Cu, Zn and Pb respectively. Geoaccumulation indices indicated that the topsoils of the burn area and dismantling areas of Agbogbloshie e-waste re...
Source: Chemosphere - July 3, 2019 Category: Chemistry Authors: Ackah M Tags: Chemosphere Source Type: research
Acute exposure to environmentally relevant concentrations of Chinese PFOS alternative F-53B induces oxidative stress in early developing zebrafish.
In this study, zebrafish embryos were exposed to various concentrations of F-53B (0, 0.5, 20 and 200 μg/L) for 5 d to investigate oxidative stress responses and possible molecular mechanisms of action. Our results showed that F-53B accumulated in a concentration-dependent manner in zebrafish larvae. The contents of malondialdehyde (MDA) and reduced glutathione (GSH), as well as the activities, mRNA and protein levels of most of antioxidant enzyme genes involved in the phosphatidylinositol 3-kinase (PI3K)/Akt/Nrf2-ARE pathway were significantly reduced. Further in silico study indicated that F-53B binds tightly to PI...
Source: Chemosphere - July 3, 2019 Category: Chemistry Authors: Wu Y, Huang J, Deng M, Jin Y, Yang H, Liu Y, Cao Q, Mennigen JA, Tu W Tags: Chemosphere Source Type: research
The interaction between ionic liquids (ILs) and an enriched ammonia oxidising bacteria (AOB) culture.
This study demonstrated that although longer chain ILs have a greater degree of removal, and they are also more toxic to AOB at higher concentration. PMID: 31284132 [PubMed - as supplied by publisher] (Source: Chemosphere)
Source: Chemosphere - July 3, 2019 Category: Chemistry Authors: Chua FJD, Yan W, Zhou Y Tags: Chemosphere Source Type: research
Effects of environmental governance in mining areas: The trend of arsenic concentration in the environmental media of a typical mining area in 25 years.
In this study, the achievements and limitations of different EMMs of a typical mining area-Huangchang realgar mine-located in Hunan province were explored. The variations in the arsenic concentrations in the soil, agricultural products, drinking water, and atmosphere in 25 years of EMM implementation were investigated. Source control measures, such as ceasing mining and smelting activities, disposal of waste residues, and purifying wastewater, significantly reduced the arsenic concentrations in the atmosphere and surface water by more than 99%-from 68 μg m-3 and 0.42 mg L-1 to 3.63 ng m-3 and 4.31 μg ...
Source: Chemosphere - July 3, 2019 Category: Chemistry Authors: Zhao C, Yang J, Zheng Y, Yang J, Guo G, Wang J, Chen T Tags: Chemosphere Source Type: research
Removal of lead by rice husk biochars produced at different temperatures and implications for their environmental utilizations.
Abstract Rice husk is a common agricultural waste. The utilization of rice husk biochar depends on the characteristics of biochar and its interaction mechanisms with heavy metals. In the present study, rice husk biochars at three different temperatures 300, 500, and 700 °C were produced (RH300, RH500, and RH700). The characteristics of these rice husk biochars and their interaction mechanisms with lead (Pb) were investigated, in order to reveal the potential environmental applications of the biochars. It was observed that the surface area (from 0.632 to 193.149 m2/g) and pH (from 7.13 to 9.80) of the rice ...
Source: Chemosphere - July 2, 2019 Category: Chemistry Authors: Shi J, Fan X, Tsang DCW, Wang F, Shen Z, Hou D, Alessi DS Tags: Chemosphere Source Type: research
Oxidative stress and genotoxic effects in earthworms induced by five imidazolium bromide ionic liquids with different alkyl chains.
In this study, the acute and subchronic toxicity of 1-alkyl-3-methyl imidazole bromide ionic liquids (ILs) [Cnmim]Br (n = 2, 4, 6, 10, 12) was evaluated utilizing earthworms (Eisenia fetida) as a basis for their impact on terrestrial ecosystems. The filter paper tests and artificial soil tests were conducted as acute toxicity tests to investigate the LC50 of ILs, while in subchronic toxicity tests, earthworms were exposed to ILs in artificial soil (5, 10, 20 and 40 mg kg-1) for 28 d. Reactive oxygen species (ROS), antioxidant enzymes, detoxifying enzymes and oxidative damage were measured to determine subchronic ...
Source: Chemosphere - July 1, 2019 Category: Chemistry Authors: Shao Y, Wang J, Wang J, Du Z, Li B, Zhu L, Juhasz A, Liu X, Xu Y, Li W Tags: Chemosphere Source Type: research
Metal tolerant bacteria enhanced phytoextraction of lead by two accumulator ornamental species.
In this study, Pb resistant strains were isolated and investigated for potential effects on plant growth and Pb phytoextraction. Incubation experiments were carried for inoculated and un-inoculated soil containing different levels of Pb. Results revealed that 20% of the isolated bacteria could tolerate Pb up to 800 mg L-1. Five Pb resistant strains with plant growth promoting (PGP) abilities were evaluated for possible influence on water soluble Pb through soil incubation experiments and significant increase i.e. 1.85- and 1.49-folds in water soluble Pb was observed for NCCP-1848 and NCCP-1862 strains, respectively. Po...
Source: Chemosphere - July 1, 2019 Category: Chemistry Authors: Manzoor M, Gul I, Ahmed I, Zeeshan M, Hashmi I, Amin BAZ, Kallerhoff J, Arshad M Tags: Chemosphere Source Type: research
Life-time exposure to waterborne copper III: Effects on the energy metabolism of the killifish Poecilia vivipara.
Abstract Copper ions (Cu) are essential to life maintenance, nonetheless, elevated concentrations can be hazardous. Acute and sub-chronic toxic effects of this metal are well known and are usually related to enzymatic inhibition, elevated ROS production and dysfunction of energy metabolism. Despite that, chronic studies are extremely rare. Therefore, the aim of this study was to assess the effects of chronic exposure to 5, 9 and 20 μg/L Cu (28 ad 345 days) on the energy metabolism and survival of the killifish Poecilia vivipara. To accomplish that, we evaluated the activity of enzymes related to aerobic (pyru...
Source: Chemosphere - July 1, 2019 Category: Chemistry Authors: Abou Anni IS, Zebral YD, Afonso SB, Moreno Abril SI, Lauer MM, Bianchini A Tags: Chemosphere Source Type: research
Degradation of bisphenol a using peroxymonosulfate activated by WO3@MoS2/Ag hollow nanotubes photocatalyst.
Abstract WO3@MoS2/Ag (HW@MA) hollow tubes were successfully engineered to photodegrade bisphenol A (BPA) combined with peroxymonosulfate (PMS) for the first time. XRD, XPS, TEM and SEM were conducted. The HW@MA tubes present excellent photocatalytic performance on the removal of BPA. The intermediate products of BPA were investigated by GC-MS analysis and the degradation pathway was proposed. To explore the transferred mechanism of photoproduced carriers, the electron paramagnetic resonance (EPR) technique was carried out. The results revealed that the superoxide radical (O2-), hydroxyl radical (OH), sulfate radic...
Source: Chemosphere - July 1, 2019 Category: Chemistry Authors: Zeng Y, Guo N, Xu X, Yu Y, Wang Q, Wang N, Han X, Yu H Tags: Chemosphere Source Type: research
Carbonic anhydrase activity as a potential biomarker for acute exposure to copper in corals.
Abstract Coral reefs are subjected to climate change and are severely impacted by human activities, with copper (Cu) being a relevant physiological stressor for corals at local scale. The ecological relevance of parameters measured at biochemical or cellular level is now considered an extremely important feature in environmental studies, and can be used as early warning signs of environmental degradation. In this context, the effects of acute exposure (96 h) to Cu were assessed on the maximum photochemical efficiency of zooxanthellae (Fv/Fm) and on the activity of key enzymes [carbonic anhydrase (CA) and Ca-ATPa...
Source: Chemosphere - July 1, 2019 Category: Chemistry Authors: Fonseca JDS, Marangoni LFB, Marques JA, Bianchini A Tags: Chemosphere Source Type: research
Opportunities of electrokinetics for the remediation of mining sites in Biga peninsula, Turkey.
This study investigated the geological conditions of Biga Peninsula. There are metamorphic rocks, ophiolitic melange, plutonic rocks, subvolcanics, volcanic rocks and volcanoclastics along with marine and terrestrial sediments in the region. This variety of rocks and the associated minerals resulted in many interesting metallic ores and coal for commercial exploitation. The mining exploitations in Biga Peninsula (Turkey) pose an environmental risk due to the release of contaminants, metals and arsenic, to the soil and waterbodies. This study analyzed the potential release of As and metals (Al, Fe, Mn) from a sediment sampl...
Source: Chemosphere - July 1, 2019 Category: Chemistry Authors: Karaca O, Cameselle C, Bozcu M Tags: Chemosphere Source Type: research
Fractions and colloidal distribution of arsenic associated with iron oxide minerals in lead-zinc mine-contaminated soils: Comparison of tailings and smelter pollution.
In this study, As fractions associated with Fe oxide minerals in Pb-Zn tailings- and smelter-contaminated soils were compared using sequential extraction techniques. Kinetic experiments were conducted to characterize the reactivity of Fe oxide minerals. The distribution of As and Fe oxide minerals in soil colloids were analyzed. The results show that in mining-contaminated soils (both tailings and smelter) the relatively active fraction (amorphous hydrous oxide-bound As, AsF3) has a strong relationship with easily reducible Fe (Feox1). In smelter-contaminated soils, relatively stable fractions (crystalline hydrous oxide-bo...
Source: Chemosphere - July 1, 2019 Category: Chemistry Authors: Ma J, Lei M, Weng L, Li Y, Chen Y, Islam MS, Zhao J, Chen T Tags: Chemosphere Source Type: research
Temporal trends and sediment-water partitioning of per- and polyfluoroalkyl substances (PFAS) in lake sediment.
Abstract The use of per- and polyfluoroalkyl substances (PFAS) containing aqueous film forming foams (AFFF) at fire training facilities can have an adverse impact on the surrounding environment. The aim of the present study was to study the distribution and temporal trend of 26 PFAS in water and sediment cores for a lake and a pond affected by AFFF release from a fire training facility in Luleå, northern Sweden. In the aqueous phase, maximum ΣPFAS concentration was 1.700 ± 90 ng L-1. Dominant PFAS groups were perfluoroalkane sulfonates (PFSAs) with 70% of the ΣPFAS, followed by per...
Source: Chemosphere - July 1, 2019 Category: Chemistry Authors: Mussabek D, Ahrens L, Persson KM, Berndtsson R Tags: Chemosphere Source Type: research
Chlorinated paraffins (CPs) in salmon sold in southern Germany: Concentrations, homologue patterns and relation to other persistent organic pollutants.
In this study 122 farmed and 11 wild salmon samples were collected over the course of four years (2014-2017). The ratio of short-chain CP and medium-chain CP and the corresponding homologue patterns were determined by means of gas chromatography (GC) with high resolution, accurate mass Orbitrap mass spectrometry (MS) technology. Characteristic patterns were observed, enabling differentiation between European and non-European (Chilean) samples. Concentration ranges of short-chain CPs (0.97-170 ng/g ww) and medium-chain CPs (1.1-79 ng/g ww) were similarly widespread over three orders of magnitude. Yet, both the mean and ...
Source: Chemosphere - July 1, 2019 Category: Chemistry Authors: Krätschmer K, Schächtele A, Malisch R, Vetter W Tags: Chemosphere Source Type: research
Comparative geochemical evaluation of toxic metals pollution and bacterial communities of industrial effluent tributary and a receiving estuary in Nigeria.
Abstract Toxic metals/metalloid contaminations of estuarine sediments due to compromised tributaries arouse significant interest in studying bacterial community that triggers natural attenuation processes. Geo-accumulation index (Igeo), contamination factor (CF), pollution load index (PLI), and Hakanson potential ecological risk index (RI) as a sum of risk factors (Er) were used to quantify toxic metal/metalloid-pollution status of Lagos Lagoon (2W) and 'Iya-Alaro' tributary (4W) sediments in comparison with pristine 'Lekki Conservation Centre' sediment (L1-B). Bacteriology of the ecosystems was based on culture-i...
Source: Chemosphere - July 1, 2019 Category: Chemistry Authors: Oyetibo GO, Miyauchi K, Huang Y, Ikeda-Ohtsubo W, Chien MF, Ilori MO, Amund OO, Endo G Tags: Chemosphere Source Type: research
Effective mineralization of quinoline and bio-treated coking wastewater by catalytic ozonation using CuFe2O4/Sepiolite catalyst: Efficiency and mechanism.
In this study, CuFe2O4 nanocomposite loaded on natural sepiolite (CuFe2O4/SEP) was prepared by the citrate sol-gel method. CuFe2O4/SEP was characterized by X-ray diffraction, Brunauer-Emmett-Teller adsorption analysis, scanning electron microscopy, and energy dispersive spectroscopy. The CuFe2O4/SEP composite was stable and showed an excellent catalytic activity for ozonation. The efficiency of quinoline mineralization in the catalytic ozonation with CuFe2O4/SEP was 90.3%, and this value was 5.4 times higher than that of the uncatalyzed ozonation (16.8%). The quinoline mineralization followed a pseudo first-order kinetics ...
Source: Chemosphere - July 1, 2019 Category: Chemistry Authors: Liu D, Wang C, Song Y, Wei Y, He L, Lan B, He X, Wang J Tags: Chemosphere Source Type: research
Rapid Cr(VI) reduction and immobilization in contaminated soil by mechanochemical treatment with calcium polysulfide.
Abstract Mechanochemical treatment with calcium polysulfide (CPS) was applied to remediate the Cr(VI) contaminated soil. The effects of parameters including milling speed, milling time, ball to powder ratio (BPR) and dosage of CPS were investigated. The effectiveness of mechanical treatment with or without CPS is estimated by analyzing the leachable fraction of Cr(VI). The results show that mechanochemical treatment with CPS can decrease and immobilize Cr in soil more quickly and efficiently with comparison to the case without additive. Under a milling speed of 500 rpm, milling time of 2 h, BPR of 9 and CPS do...
Source: Chemosphere - July 1, 2019 Category: Chemistry Authors: Yuan W, Xu W, Zhang Z, Wang X, Zhang Q, Bai J, Wang J Tags: Chemosphere Source Type: research
High-flux ultrafiltration membrane with open porous hydrophilic structure using dual pore formers.
Abstract This work investigated the synergistic effect of polyvinylpyrrolidone (PVP) and hydroxypropyl-beta-cyclodextrin (HP-β-CD) as dual pore forming agents on the properties and performance of polysulfone (PSf) ultrafiltration membranes. A fixed concentration of PVP and varying concentrations of HP-β-CD were used to prepare the membranes using the phase inversion technique. The results showed that the inclusion of these additives in the dope solution increased its thermodynamic instability and promoted instantaneous demixing. Overall, an increase was observed in the hydrophilicity, open porous structu...
Source: Chemosphere - July 1, 2019 Category: Chemistry Authors: Alayande AB, Obaid M, Yu HW, Kim IS Tags: Chemosphere Source Type: research
Bioremediation of chlorophenol-contaminated sawmill soil using pilot-scale bioreactors under consecutive anaerobic-aerobic conditions.
Abstract Chlorophenols (CPs), including pentachlorophenol (PCP), are chemicals of concern due to their toxicity and persistence. Here we describe a successful reactor-based remediation of CP-contaminated soil and assess changes in the toxicity patterns and bacterial communities during the remediation. The remediation consisted of separating half of the contaminated soil to be ground (samples M) in order to test whether the grinding expedited the remediation, the other half was left unground (samples P). Both soils were mixed with wastewater treatment sludge to increase their bacterial diversity and facilitate the ...
Source: Chemosphere - July 1, 2019 Category: Chemistry Authors: Lopez-Echartea E, Strejcek M, Mateju V, Vosahlova S, Kyclt R, Demnerova K, Uhlik O Tags: Chemosphere Source Type: research
Emerging sustainable technologies for remediation of soils and groundwater in a municipal solid waste landfill site -- A review.
Abstract Remediation of soils and groundwater in a municipal solid wastes (MSW) landfill site emerges as a global challenge to the living environment on earth with significant market potential. Unlike contaminants in an industry or agricultural site, contaminants from MSW landfills are diverse, primarily consisting of chemical oxygen demand (COD), inorganic matter (ammonia-nitrogen, nitrate-nitrogen, total phosphorus) and heavy metals. This renders new challenges to remediation contaminants of different characters altogether. A status quo of existing technologies, including permeable reactive barriers, electrokine...
Source: Chemosphere - July 1, 2019 Category: Chemistry Authors: Ye J, Chen X, Chen C, Bate B Tags: Chemosphere Source Type: research
First record of characterization, concentration and distribution of microplastics in coastal sediments of an urban fjord in south west Norway using a thermal degradation method.
T, Grati F Abstract Plastic waste is of increasing concern in the aquatic environment. A large proportion of plastic waste is generated onshore from where it eventually reaches the marine environment, which is considered the main sink of plastic debris To date there is a substantial lack of knowledge on the composition of these accumulated polymers, their environmental levels and distribution in marine and coastal areas. Current efforts are underway to develop standardized methods to characterize and quantify the occurrence of microplastic in different environmental matrices using microscopy-oriented methods using...
Source: Chemosphere - July 1, 2019 Category: Chemistry Authors: Gomiero A, Øysæd KB, Agustsson T, van Hoytema N, van Thiel T, Grati F Tags: Chemosphere Source Type: research
Ammonia inhalation-mediated mir-202-5p leads to cardiac autophagy through PTEN/AKT/mTOR pathway.
In conclusion, these results demonstrated that excess ammonia can cause cardiac damage and mediate mir-202-5p to regulate autophagy through PTEN/AKT/mTOR pathway in the chicken heart injury. Our findings will provide a new insight for better assessing the toxicity mechanism of environmental pollutants ammonia on the heart. PMID: 31284134 [PubMed - as supplied by publisher] (Source: Chemosphere)
Source: Chemosphere - July 1, 2019 Category: Chemistry Authors: Xing H, Peng M, Li Z, Chen J, Zhang H, Teng X Tags: Chemosphere Source Type: research
Room-temperature hydrolysis fabrication of BiOBr/Bi12O17Br2 Z-Scheme photocatalyst with enhanced resorcinol degradation and NO removal activity.
This study provides a facile strategy for bismuth halide Z-scheme heterojunction constructing at room temperature and also sheds light on highly efficient photocatalysts designing. PMID: 31280045 [PubMed - as supplied by publisher] (Source: Chemosphere)
Source: Chemosphere - July 1, 2019 Category: Chemistry Authors: Li R, Xie F, Liu J, Zhang C, Zhang X, Fan C Tags: Chemosphere Source Type: research
Dominance of electroactive microbiomes in bioelectrochemical remediation of hydrocarbon-contaminated soils with different textures.
This study however found the abundant EAB Geobacter (∼27.3%) in the anodic biofilms, which confirmed the role of electroactive bio-anode on the conversion of hydrocarbons into the current for the enhancement of remediation. Widespread occurrence of aerobic hydrocarbon-degrading bacteria (HDB) (e.g. ∼24.0% Parvibaculum and ∼30.6% Pseudomonas) was observed in soils with limited dissolved oxygen (∼0.4 mg/L). The higher abundance of dehydrogenase genes was found in the anode biofilms than that in soils, indicating anodic microorganisms may be mainly responsible for the removal of intermediates of aerobic hydr...
Source: Chemosphere - July 1, 2019 Category: Chemistry Authors: Wang H, Lu L, Mao D, Huang Z, Cui Y, Jin S, Zuo Y, Ren ZJ Tags: Chemosphere Source Type: research
Airborne particulate matter induces mitotic slippage and chromosomal missegregation through disruption of the spindle assembly checkpoint (SAC).
errera LA, García-Cuellar CM Abstract Particulate matter (PM) is a risk factor for lung cancer development and chromosomal missegregation and cell cycle disruptions are key cellular events that trigger tumorigenesis. We aimed to study the effect of PM10 (PM with an aerodynamic diameter ≤10 μm) on mitotic arrest and chromosomal segregation, evaluating the spindle assembly checkpoint (SAC) protein dynamics in the human lung A549 adenocarcinoma cell line. For this purpose, synchronized cells were exposed to PM10 for 24 h to obtain the frequency of micronucleated (MN) and trinucleated (TN) cells. Then...
Source: Chemosphere - July 1, 2019 Category: Chemistry Authors: Santibáñez-Andrade M, Sánchez-Pérez Y, Chirino YI, Morales-Bárcenas R, Herrera LA, García-Cuellar CM Tags: Chemosphere Source Type: research
The impact of low to high waste cooking oil-based biodiesel blends on toxic organic pollutant emissions from heavy-duty diesel engines.
Abstract As yet, the effect of biodiesels on the emissions of polycyclic aromatic hydrocarbons (PAHs) and polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) from heavy-duty diesel engines (HDDEs) has only been studied using limited fuel blend ratios. To clarify the influence of using higher fractions of biodiesel on the emissions of toxic organic pollutants from diesel engines, in this research, the emissions of PM, PAHs, and persistent organic pollutants (POPs) from EURO IV and EURO III HDDEs fueled by low to high waste cooking oil (WCO)-based biodiesel-petrodiesel fuel blends were studied, including D...
Source: Chemosphere - July 1, 2019 Category: Chemistry Authors: Cheruiyot NK, Hou WC, Wang LC, Chen CY Tags: Chemosphere Source Type: research
Cylindrospermopsin induces cellular stress and activation of ERK1/2 and p38 MAPK pathways in adult human liver stem cells.
aacute; I, Bláha L, Babica P Abstract Cyanobacterial toxin cylindrospermopsin (CYN) is an emerging freshwater contaminant, whose expanding environmental occurrence might result into increased human health risks. CYN is potent hepatotoxin, with cytotoxicity and genotoxicity documented in primary hepatocytes or hepatoma cell lines. However, there is only limited information about CYN effects on adult human liver stem cells (LSCs), which play an important role in liver tissue development, regeneration and repair. In our study with human liver cell line HL1-hT1 which expresses characteristics of LSCs, CYN was f...
Source: Chemosphere - July 1, 2019 Category: Chemistry Authors: Raška J, Čtveráčková L, Dydowiczová A, Sovadinová I, Bláha L, Babica P Tags: Chemosphere Source Type: research
Toxic effects of a methanolic coal dust extract on fish early life stage.
This study aims to evaluate the toxic effect of a methanolic coal dust extract on a fish early life stage by analyzing phenotypic alterations, transcriptome changes, and mortality in zebrafish (ZF) embryos. ZF embryos were exposed to methanolic coal dust extract at 1-5000 mg·L-1 and monitored using bright field microscopy 24 and 48 hpf to determine malformations and mortality. In situ hybridization, RNA sequencing, and qRT-PCR were employed to identify transcriptome changes in malformed embryos. Three malformed phenotypes were generated in a dose-dependent manner. In situ hybridization analysis revealed brain, som...
Source: Chemosphere - June 30, 2019 Category: Chemistry Authors: Guerrero-Castilla A, Olivero-Verbel J, Sandoval IT, Jones DA Tags: Chemosphere Source Type: research
Comparison study of zinc nanoparticles and zinc sulphate on wheat growth: From toxicity and zinc biofortification.
Abstract ZnO nanoparticles (NPs) are studied as a potential solution to alleviate Zn deficiency in human diet due to their special physicochemical properties. However, information for food quality and safety in NP-treated crops is limited. The effects of ZnO NPs and ZnSO4 on germination and growth of wheat (Triticum aestivum L.) were studied in germination and pot experiments. Zn content increased significantly, ZnO NPs were more effective than ZnSO4 at increasing grain Zn content, but less effective at increasing leaf Zn, and no ZnO NPs were detected in the wheat tissues by NP-treatments, indicated by XRD. Both Z...
Source: Chemosphere - June 30, 2019 Category: Chemistry Authors: Du W, Yang J, Peng Q, Liang X, Mao H Tags: Chemosphere Source Type: research