Comparison of distillation with other current isolation methods for the determination of methyl mercury compounds in low level environmental samples

Horvat, Milena; Bloom, Nicolas S.; Lian, Liang

doi:10.1016/0003-2670(93)85348-n

Cited by 365 publications

(198 citation statements)

References 15 publications

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“…Unlike total-Hg concentrations, methyl-Hg concentrations in analyzed samples were determined using a method adapted from previous publications (Bloom 1989;Horvat et al 1993). Briefly, about 1 g of freeze-dried sediment was digested with a 25 % KOH/methanol solution and sample distillation method avoided to minimize the artificial methylation artifact reported by other researchers (Horvat et al 1993). Next, samples in loosely capped Teflon vials were placed in an oven at 45°C overnight.…”

Section: Sample Collection and Analysismentioning

confidence: 99%

Linking landscape development intensity within watersheds to methyl-mercury accumulation in river sediments

Donkor

Attibayeba

Gao

2015

Ambio

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An indicator of the disturbance of natural systems, the landscape development intensity (LDI) index, was used to assess the potential for land-use within watersheds to influence the production/ accumulation of methyl-mercury (MeHg) in river sediments. Sediment samples were collected from locations impacted by well-identified land-use types within the Mobile-Alabama River Basin in Southeastern USA. The samples were analyzed for total-Hg (THg) and MeHg concentrations and the obtained values correlated to the calculated LDI indexes of the sampled watersheds to assess the impact of prevalent land use/land cover on MeHg accumulation in sediments. The results show that unlike THg, levels of MeHg found in sediments are impacted by the LDI indexes. Overall, certain combinations of land-use types within a given watershed appear to be more conducive to MeHg accumulation than others, therefore, pointing to the possibility of targeting land-use practices as potential means for reducing MeHg accumulation in sediments, and ultimately, fish contamination.

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Section: Sample Collection and Analysismentioning

confidence: 99%

Linking landscape development intensity within watersheds to methyl-mercury accumulation in river sediments

Donkor

Attibayeba

Gao

2015

Ambio

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“…Several authors [11][12][13][14][15][21][22][23][24] cite the accidental MeHg formation as one of the main problems in determining this analite and consequently in the organic Hg determination. According to these authors, the % of Hg +2 methylated is low (up to 0.5%, but normally between 0.01 to 0.05% in relation to Hg +2 ).…”

Section: Inorganic Hgmentioning

confidence: 99%

Organic and total mercury determination in sediments by cold vapor atomic absorption spectrometry: methodology validation and uncertainty measurements

et al. 2012

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Recebido em 10/1/11; aceito em 1/6/11; publicado na web em 22/7/11The purpose of the present study was to validate a method for organic Hg determination in sediment. The procedure for organic Hg was adapted from literature, where the organomercurial compounds were extracted with dichloromethane in acid medium and subsequent destruction of organic compounds by bromine chloride. Total Hg was performed according to 3051A USEPA methodology. Mercury quantification for both methodologies was then performed by CVAAS. Methodology validation was verified by analyzing certified reference materials for total Hg and methylmercury. The uncertainties for both methodologies were calculated. The quantification limit of 3.3 µg kg -1 was found for organic Hg by CVAAS.

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“…The detection limit for the method is approximately 5 ng/g. Methylmercury was determined using a combination of two methods (Horvat et al 1993;Liang et al 1994). Methylmercury was determined by aqueous phase ethylation, cryogenic trapping, and chromatographic desorption followed by detection with cold vapor atomic fluorescence.…”

Section: Chemical Analysismentioning

confidence: 99%

“…Methylmercury was determined by aqueous phase ethylation, cryogenic trapping, and chromatographic desorption followed by detection with cold vapor atomic fluorescence. Distillation was used to separate methylmercury from other interfering species as described by Horvat et al (1993).…”

Section: Chemical Analysismentioning

confidence: 99%

The Effect of Mercury and PCBs on Organisms from Lower Trophic Levels of a Georgia Salt Marsh

Wall

2001

Archives of Environmental Contamination and Toxicology

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Abstract. We examined several indicators of salt marsh function, focusing on primary producers, microbes, and grass shrimp, at a Superfund site (LCP) contaminated with mercury and polychlorinated biphenyls (PCBs) and a reference site (Cross-River) in Georgia. Primary production of Spartina alterniflora was assessed by measuring peroxidase activity (POD), glutathione concentration (tGSH), photosynthesis (A net ), and transpiration (E). Microbial populations were assessed by measuring living-fungal standing crop (as ergosterol) and Microtox . Grass shrimp (Palaemonetes pugio) reproductive potential was determined by measuring individual egg mass, average egg area, brood size, and brood mass of gravid females. Comparison of the sites suggested that P. pugio reproduction was affected at the LCP site, but we were unable to document clear negative effects on other organisms we investigated. Due to natural environmental gradients, the CrossRiver site may not have been a perfect control for the LCP site. Therefore, data from just the LCP site were reanalyzed using multiple regression. Fungal biomass was related to methylmercury concentrations, but the direction of the relationship differed between wholly dead shoots (positive) and partially dead shoots (negative). S. alterniflora POD was positively related to methylmercury concentrations. S. alterniflora A net and E were negatively related to elevation and salinity, respectively. Despite high levels of contamination at the LCP site, our results provided only suggestive evidence for impacts on organisms at lower trophic levels.

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Comparison of distillation with other current isolation methods for the determination of methyl mercury compounds in low level environmental samples

Cited by 365 publications

References 15 publications

Linking landscape development intensity within watersheds to methyl-mercury accumulation in river sediments

Linking landscape development intensity within watersheds to methyl-mercury accumulation in river sediments

Organic and total mercury determination in sediments by cold vapor atomic absorption spectrometry: methodology validation and uncertainty measurements

The Effect of Mercury and PCBs on Organisms from Lower Trophic Levels of a Georgia Salt Marsh

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