Use of constructed wetlands with four different experimental designs to assess the potential for methyl and total Hg outputs

Gustin, Mae Sexauer; Chavan, Prithviraj V.; Dennett, Keith E.; Donaldson, Susan G.; Marchand, Éric; Fernanadez, George

doi:10.1016/j.apgeochem.2006.08.012

Cited by 14 publications

(7 citation statements)

References 44 publications

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“…Malcolm et al, 30 , found it to be a weak methylator, however, the genome sequence is not available. These predicted Hg-methylators include strains from freshwater wetlands and wastewater treatment sludge (Table S3); known locations of MeHg production where iron and sulfate reduction may not be dominant [32][33][34][35] . 36,37 , and metabolize methylamines, MeOH, and dimethylsulfide.…”

Section: Resultsmentioning

confidence: 99%

Mercury Methylation by Novel Microorganisms from New Environments

Gilmour

Podar²,

Bullock

et al. 2013

Environ. Sci. Technol.

622

539

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Microbial mercury (Hg) methylation transforms a toxic trace metal into the highly bioaccumulated neurotoxin methylmercury (MeHg). The lack of a genetic marker for microbial MeHg production has prevented a clear understanding of Hg-methylating organism distribution in nature. Recently, a specific gene cluster (hgcAB) was linked to Hg methylation in two bacteria.1 Here we test if the presence of hgcAB orthologues is a reliable predictor of Hg methylation capability in microorganisms, a necessary confirmation for the development of molecular probes for Hg-methylation in nature. Although hgcAB orthologues are rare among all available microbial genomes, organisms are much more phylogenetically and environmentally diverse than previously thought. By directly measuring MeHg production in several bacterial and archaeal strains encoding hgcAB, we confirmed that possessing hgcAB predicts Hg methylation capability. For the first time, we demonstrated Hg methylation in a number of species other than sulfate- (SRB) and iron- (FeRB) reducing bacteria, including methanogens, and syntrophic, acetogenic, and fermentative Firmicutes. Several of these species occupy novel environmental niches for Hg methylation, including methanogenic habitats such as rice paddies, the animal gut, and extremes of pH and salinity. Identification of these organisms as Hg methylators now links methylation to discrete gene markers in microbial communities.

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Section: Resultsmentioning

confidence: 99%

Mercury Methylation by Novel Microorganisms from New Environments

Gilmour

Podar²,

Bullock

et al. 2013

Environ. Sci. Technol.

622

539

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show abstract

“…In a recent study investigating the production of MeHg in constructed wetlands operating with Hg contaminated water or sediment, it was observed that temperature and SO 2− 4 correlated well with MeHg concentrations in the effluents (Gustin et al, 2006). In laboratory experiments with anoxic wetland sediments, Mehrotra and Sedlak (2005) reported that the addition of Fe(II) reduced the net rate of mercury methylation due to the decrease of dissolved sulfide.…”

Section: Mercurymentioning

confidence: 97%

Fate and Biotransformation of Metal and Metalloid Species in Biological Wastewater Treatment Processes

Stasinakis

Thomaidis

2010

Critical Reviews in Environmental Science and Technology

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Suspended and attached growth wastewater treatment processes are widely used for the removal of biodegradable organic constituents and nutrients from wastewater. The frequent detection of toxic metals and metalloids in wastewater contributed to the publishing of numerous papers in the past, investigating their presence, toxicity and behavior in biological wastewater treatment systems (BWTS). In most of these studies, data were referred to total element concentration. However, nowadays it is generally accepted that toxicological and physicochemical properties are differentiated according to elemental speciation. The literature review revealed that there are enough studies investigating chromium species presence, toxicity, fate and biotransformation in BWTS, whereas there are fewer data for organotin compounds. Even less studies exist for arsenic, mercury and selenium species. Most of the results are referred to the activated sludge process. The biotransformation mechanisms are element-dependent. The reduction of Cr(VI) to Cr(III), the sequential debutylation of tributyltin and triphenyltin to inorganic tin, the oxidation of As(III) to As(V) and their methylation to organoarsenicals have been observed. Despite the gaps in the literature, these preliminary, in many cases, results indicate that biological wastewater treatment processes could be used in the future for the detoxification of metal-and metalloid-laden wastewater, allowing the reuse of wastewater and sludge.

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“…Below are the citations to the papers that the above paper does not reference [1,2]. The fact that they were published prior to this paper and that both corresponding authors on the Hazardous Materials manuscript were aware of these manuscripts leaves no excuse for their lack of citation in the Chavan et al paper.…”

mentioning

confidence: 89%

Letter to the Editor

Gustin¹

2010

Journal of Hazardous Materials

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Use of constructed wetlands with four different experimental designs to assess the potential for methyl and total Hg outputs

Cited by 14 publications

References 44 publications

Mercury Methylation by Novel Microorganisms from New Environments

Mercury Methylation by Novel Microorganisms from New Environments

Fate and Biotransformation of Metal and Metalloid Species in Biological Wastewater Treatment Processes

Letter to the Editor

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