Microbial transformation of arsenic species in municipal landfill leachate

Li, Yarong; Low, Gary; Scott, Jason; Amal, Rose

doi:10.1016/j.jhazmat.2011.01.093

Cited by 22 publications

(9 citation statements)

References 37 publications

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“…Furthermore, the genus Pseudomonas has been widely detected in landfills and other contaminated environments (Gomez et al, 2011;Li et al, 2011). Pseudomonas are well-known pollutantdegrading bacteria that utilize a wide range of polycyclic aromatic hydrocarbons as their sole carbon source (Loick et al, 2009) and have roles in organic matter degradation (Horel et al, 2015) and denitrification (Lalucat et al, 2006).…”

Section: Microbial Taxonomic Analysis At the Genus Levelmentioning

confidence: 99%

Microbial community structure and diversity in a municipal solid waste landfill

et al. 2017

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Municipal solid waste (MSW) landfills are the most prevalent waste disposal method and constitute one of the largest sources of anthropogenic methane emissions in the world. Microbial activities in disposed waste play a crucial role in greenhouse gas emissions; however, only a few studies have examined metagenomic microbial profiles in landfills. Here, the MiSeq high-throughput sequencing method was applied for the first time to examine microbial diversity of the cover soil and stored waste located at different depths (0-150cm) in a typical MSW landfill in Yangzhou City, East China. The abundance of microorganisms in the cover soil (0-30cm) was the lowest among all samples, whereas that in stored waste decreased from the top to the middle layer (30-90cm) and then increased from the middle to the bottom layer (90-150cm). In total, 14 phyla and 18 genera were found in the landfill. A microbial diversity analysis showed that Firmicutes, Proteobacteria, and Bacteroidetes were the dominant phyla, whereas Halanaerobium, Methylohalobius, Syntrophomonas, Fastidiosipila, and Spirochaeta were the dominant genera. Methylohalobius (methanotrophs) was more abundant in the cover layers of soil than in stored waste, whereas Syntrophomonas and Fastidiosipila, which affect methane production, were more abundant in the middle to bottom layers (90-150cm) in stored waste. A canonical correlation analysis showed that microbial diversity in the landfill was most strongly correlated with the conductivity, organic matter, and moisture content of the stored waste.

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Section: Microbial Taxonomic Analysis At the Genus Levelmentioning

confidence: 99%

Microbial community structure and diversity in a municipal solid waste landfill

et al. 2017

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“…Reaction of these small species, which will be present together during some solid combustion, such as coal or wastes, would disserve further investigations. The proposed methodology could also be applied to determine kinetics of contaminants such as pesticides or organoarsenic produced by microbial reduction of arsenic salts in municipal landfill (Li et al, 2011).…”

Section: Resultsmentioning

confidence: 99%

Kinetic modeling of the thermal destruction of lewisite

Lizardo-Huerta

Sirjean

Verdier³

et al. 2020

Journal of Hazardous Materials

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Organoarsenic compounds have been widely used as pesticides and chemical agents. Lewisite (C 2 H 2 AsCl 3), a blister agent, is a model of such compounds. A comprehensive detailed kinetic mechanism of combustion has been developed based on theoretical investigations. A benchmark allowed to select an appropriate methodology able to deal with such a heavy atom as As with precision and reasonable computational times. The density functional theory (DFT) method ωB97X-D was found to give the best results on target data. Core pseudo potentials were used for arsenic with the cc-pVTZ-PP basis set, whereas Def2-TZVP basis set was used for other atoms. The mechanism of the decomposition of lewisite includes all reactions involved in thermal decomposition and combustion mechanisms, including molecular and radical intermediates, and the decomposition reactions of small species containing arsenic. Simulation shows that lewisite decomposition starts around 700K and is very little sensitive to the presence of oxygen since the radical reactions involve mainly very reactive Cl-atoms as chain carriers. The main reaction paths have been derived. As experimentally observed, AsCl 3 is the main arsenic product produced almost in one-to-one yield, whereas acetylene is an important hydrocarbon product in pyrolysis. In combustion, several arsenic oxides, eventually chlorinated, are produced, which toxicity need to be assessed.

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“…These studies demonstrated the difference in the formation of thiolated arsenic species between animal species. An increasing body of studies has demonstrated that microbes in the environment or the animal gastrointestinal tract are able to produce thio-containing arsenicals using different substrates such as inorganic arsenic and DMA V , as well as As-contaminated soils, − ,− suggesting that intestinal microbiota could be the major producer of thio-containing arsenicals. Metagenomic sequencing and arsenic speciation analysis revealed that mouse gut microbiome perturbation by bacterial infection substantially altered the spectra of arsenic metabolites including methylated and thiolated arsenic .…”

Section: Resultsmentioning

confidence: 99%

Identification of Methylated Dithioarsenicals in the Urine of Rats Fed with Sodium Arsenite

Chen

Arnold

et al. 2016

Chem. Res. Toxicol.

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Biotransformation of inorganic arsenic results in the formation of methylarsenicals of both oxygen and sulfur analogues. Aiming to improve our understanding of metabolism of inorganic arsenic in animals, we conducted an animal feeding study with an emphasis on identifying new arsenic metabolites. Female F344 rats were given 0, 1, 10, 25, 50, and 100 μg/g of arsenite (iAs(III)) in the diet. Arsenic species in rat urine were determined using high performance liquid chromatography (HPLC) separation and inductive coupled plasma mass spectrometry (ICPMS) and electrospray ionization tandem mass spectrometry (ESI MS/MS) detection. Nine arsenic species were detected in the urine of the iAs(III)-dosed rats. Seven of these arsenic species were consistent with previous reports, including iAs(III), arsenate, monomethyarsonic acid, dimethylarsinic acid, trimethylarsine oxide, monomethylmonothioarsonic acid, and dimethylmonothioarsinic acid. Two new methyldithioarsencals, monomethyldithioarsonic acid (MMDTA(V)) and dimethyldithioarsinic acid (DMDTA(V)), were identified for the first time in the urine of rats treated with iAs(III). The concentrations of both MMDTA(V) and DMDTA(V) in rat urine were dependent on the dosage of iAs(III) in diet. The concentration of DMDTA(V) was approximately 5 times higher than that of MMDTA(V). MMDTA(V) has not been identified in any biological samples of animals, and DMDTA(V) has not been reported as a metabolite of inorganic arsenic in the rats. The identification of novel methylated dithioarsenicals as metabolites of inorganic arsenic in the rat urine provided further insights into the understanding of the metabolism of arsenic.

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Microbial transformation of arsenic species in municipal landfill leachate

Cited by 22 publications

References 37 publications

Microbial community structure and diversity in a municipal solid waste landfill

Microbial community structure and diversity in a municipal solid waste landfill

Kinetic modeling of the thermal destruction of lewisite

Identification of Methylated Dithioarsenicals in the Urine of Rats Fed with Sodium Arsenite

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