Enhancing the relative abundance of comammox nitrospira in ammonia oxidizer community decreases N < sub > 2 < /sub > O emission in nitrification exponentially
Chemosphere. 2024 Apr 5:141883. doi: 10.1016/j.chemosphere.2024.141883. Online ahead of print.ABSTRACTComammox Nitrospira and canonical ammonia-oxidizing bacteria (cAOB) generally coexist in activated sludge. In present study, the effect of comammox Nitrospira on N2O production during nitrification of activated sludge was investigated. Comammox Nitrospira and cAOB were separately enriched in two nitrifying reactors, with respective relative abundance of approximately 98% in ammonia oxidizer community. The N2O emission factor (EF) of nitrification in comammox Nitrospira dominated reactor was 0.35%, consistently lower than t...
Source: Chemosphere - April 7, 2024 Category: Chemistry Authors: Zhichang Ren Deyong Li Zhuang Zhang Weimin Sun Guoqiang Liu Source Type: research
Size dependent ingestion and effects of microplastics on survivability, hematology and intestinal histopathology of juvenile striped catfish (Pangasianodon hypophthalmus)
Chemosphere. 2024 Apr 5:141827. doi: 10.1016/j.chemosphere.2024.141827. Online ahead of print.ABSTRACTMicroplastic pollution is drastically increasing in aquatic ecosystems and it is assumed that different sizes of microplastics have diverse impacts on the physiology of aquatic organisms. Therefore, this study was intended to examine the ingestion and size specific effects of polyamide microplastic (PA-MP) on different physiological aspects such as growth, feed utilization, survivability, blood parameters and intestinal histopathology of juvenile striped catfish (Pangasianodon hypophthalmus). In a 28-day exposure, the fish...
Source: Chemosphere - April 7, 2024 Category: Chemistry Authors: Sheik Istiak Md Shahriar Naimul Islam Farhan Jamil Emon Mohammad Ashaf-Ud-Doulah Saleha Khan Md Shahjahan Source Type: research
Developmental toxicity of pre-production plastic pellets affects a large swathe of invertebrate taxa
Chemosphere. 2024 Apr 5:141887. doi: 10.1016/j.chemosphere.2024.141887. Online ahead of print.ABSTRACTMicroplastics pose risks to marine organisms through ingestion, entanglement, and as carriers of toxic additives and environmental pollutants. Plastic pre-production pellet leachates have been shown to affect the development of sea urchins and, to some extent, mussels. The extent of those developmental effects on other animal phyla remains unknown. Here, we test the toxicity of environmental mixed nurdle samples and new PVC pellets for the embryonic development or asexual reproduction by regeneration of animals from all th...
Source: Chemosphere - April 7, 2024 Category: Chemistry Authors: Eva Jimenez-Guri Periklis Paganos Claudia La Vecchia Giovanni Annona Filomena Caccavale Maria Dolores Molina Alfonso Ferr ández-Roldán Rory Daniel Donnellan Federica Salatiello Adam Johnstone Maria Concetta Eliso Antonietta Spagnuolo Cristian Ca ñestro Source Type: research
Efficiency of magnesium oxide nanoparticle in contaminants removal from environmental water samples: Optimization through central composite design
Chemosphere. 2024 Apr 5:141734. doi: 10.1016/j.chemosphere.2024.141734. Online ahead of print.ABSTRACTThis experimental study was conducted to synthesize magnesium oxide (MgO) nanoparticles and investigate their efficiency in removing arsenic, brilliant cresyl blue, and neutral red from aqueous solutions. The MgO nanoparticles were characterized using X-ray diffraction (XRD), energy dispersive X-ray (EDS), Fourier-transform infrared spectroscopy (FTIR), and field emission scanning electron microscopy (FESEM) analyses. The results revealed that the synthesized MgO nanoparticles had a spherical structure with an estimated av...
Source: Chemosphere - April 7, 2024 Category: Chemistry Authors: Yuntian Guo Zhenyu Zhou Fahad M Alshabrmi Source Type: research
Direct visualization of pyrene diffusion in polyethylene and polyoxymethylene passive samplers
Chemosphere. 2024 Apr 5:141875. doi: 10.1016/j.chemosphere.2024.141875. Online ahead of print.ABSTRACTWhile passive sampling of ultra-low aqueous concentrations of hydrophobic organic compounds in environmental aqueous media has emerged as a promising analytical technique, there is a lack of good understanding of the fundamental diffusive processes. In this research, we used a fluorophore, pyrene, as a model compound to track diffusion in polymers through absorption and environmental media exchange processes. We directly tracked the penetration of pyrene into polyethylene (PE) and polyoxymethylene (POM) rods during absorpt...
Source: Chemosphere - April 7, 2024 Category: Chemistry Authors: Mehregan Jalalizadeh Upal Ghosh Source Type: research
