Methylation mechanism of tin(II) by methylcobalamin in aquatic systems

Chen, Baowei; Zhou, Qunfang; Liu, Jiyan; Cao, Dandan; Wang, Thanh; Jiang, Guibin

doi:10.1016/j.chemosphere.2007.01.007

Cited by 13 publications

(8 citation statements)

References 17 publications

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“…1. Tin is subject to microbial methylation in both aerobic and anaerobic sediments and methyltin compounds have been detected in both fresh and salt water (Ridley et al 1977, Braman and Tompkins 1979, Gilmour et al 1985, Chen et al 2007, Jackson et al 1982, Craig and Rapsomanikis 1985, Amouroux et al 2000, Rapsomanikis and Weber 1985. While the fraction of tin that was observed to be methylated by natural processes in many environments was relatively low and the conditions that maximize methylation (e.g., high salinity) are not present in typical freshwater streams, the potential exists for tin methylation in freshwater stream and riparian systems receiving long term discharges from outfalls being treated using tin(II) chloride and air stripping.…”

Section: Uncertainties Associated With Mercury Treatment Processmentioning

confidence: 99%

Interim Results from a Study of the Impacts of Tin (II) Based Mercury Treatment in a Small Stream Ecosystem: Tims Branch, Savannah River Site

Looney¹,

BryanJr.²,

Mathews³

et al. 2012

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to the north and the fuel and target manufacturing facility ("M Area") to the west. In the headwater areas, the Tims Branch system is a "losing stream" (its base is above the water table and water seeps into the ground). As Tims Branch flows toward the confluence with Upper Three Runs, the stream elevation intersects the groundwater and it transitions to a "gaining stream" (water flows into the stream from the groundwater). Key morphological features relevant to potential studies in this stream include: 1) a rip-rap stabilized streambed "drop" followed by a catch basin, drain and overflow weir in the M Area outfall tributary ("outfall ditch"), 2) Steed's Pond (a former farm pond located approximately midway along Tims Branch which served as a sediment trap in the past but the dam is no longer present), and 3) several "beaver" dams and associated pools.

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Section: Uncertainties Associated With Mercury Treatment Processmentioning

confidence: 99%

Interim Results from a Study of the Impacts of Tin (II) Based Mercury Treatment in a Small Stream Ecosystem: Tims Branch, Savannah River Site

Looney¹,

BryanJr.²,

Mathews³

et al. 2012

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“…Up to date the occurrence of methyltin compounds have been found in many different environmental media such as seawater [3,4], river water [5,6], lake water [6,7], sediments [8] and biological samples [3]. In addition to the anthropogenic sources [1], methyltins can be produced by the biotic and abiotic methylation [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Rapid and direct speciation of methyltins in seawater by an on-line coupled high performance liquid chromatography–hydride generation–ICP/MS system

Zhai

Liu

et al. 2009

Talanta

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a b s t r a c tA novel on-line coupled HPLC-hydride generation (HG)-ICP/MS system was developed for rapid, direct and sensitive speciation of methyltins in seawater without any pretreatment step. Methyltin compounds were separated by reversed phase HPLC, and then on-line reacted with potassium borohydride and acetic acid to generate volatile hydride products. The volatile derivatization products were separated in the spray chamber of ICP/MS and then introduced into ICP/MS by argon gas for detection. Monomethyltin (MMT), dimethyltin (DMT) and trimethyltin (TMT) were baseline separated in less than 15 min by reversed phase HPLC. The influence of KBH 4 concentration and type of acid on the system performance was investigated and optimized. Calibration curves, based on peak heights against concentration, were linear in the range of 0.5-50 ng (Sn) mL −1 of methyltins with correlation coefficients of 0.9990, 0.9990 and 0.9996 for MMT, DMT and TMT, respectively. The relative standard deviations measured at 10 ng (Sn) mL −1 for these three methyltins were in the range of 0.6-1.4% (n = 5), and the calculated detection limits (S/N = 3) for MMT, DMT and TMT were 0.266, 0.095 and 0.039 ng (Sn) mL −1 , respectively. This method was successfully applied to the speciation of methyltins in seawater with spiked recovery in the range of 95.4-106.9%. MMT and DMT were detected in all the seawater samples with concentrations in the range of 1.0-1.5 and 0.30-0.57 ng (Sn) mL −1 for MMT and DMT, respectively.

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“…Tin is subject to microbial methylation in both aerobic and anaerobic sediments and methyltin compounds have been detected in both fresh and salt water (Ridley et al 1977, Braman and Tompkins 1979, Gilmour et al 1985, Chen et al 2007, Jackson et al 1982, Craig and Rapsomanikis 1985, Amouroux et al 2000, Rapsomanikis and Weber 1985. While the fraction of tin that was observed to be methylated by natural processes in many environments was relatively low and the conditions that maximize methylation (e.g., high salinity) are not present in typical freshwater streams, the potential exists for tin methylation in freshwater stream and riparian systems receiving long term discharges from outfalls being treated using tin(II) chloride and air stripping.…”

Section: Uncertainties Associated With Mercury Treatment Processmentioning

confidence: 99%

Interim Results From a Study of the Impacts of Tin(ii) Based Mercury Treatment in a Small Stream Ecosystem: Tims Branch, Savannah River Site

Looney¹,

Mathews²

2012

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) collecting fish from a beaver pond using a backpack shocker; typical specimen of redfin pickerel; scanning electron micrograph of flocculated tin oxide particulate collected from treated water exiting the M1 air stripperParticipating Organizations: Savannah River National Laboratory, University of Georgia Savannah River Ecology Laboratory, Oak Ridge National Laboratory, and the Applied Research Center at Florida International University Printed in the United States of America Prepared For U.S. Department of Energy Office of Environmental Management Office of Site Restoration Soil and Groundwater (EM-12) DISCLAIMERThis work was prepared under an agreement with and funded by the U.S. Government. While the authors have taken care in the preparation of this report, neither the U. S. Government or its employees, nor any of its contractors, subcontractors or their employees, makes any express or implied: 1. warranty or assumes any legal liability for the accuracy, completeness, or for the use or results of such use of any information, product, or process disclosed; or 2. representation that such use or results of such use would not infringe privately owned rights; or 3. endorsement or recommendation of any specifically identified commercial product, process, or service. Any views and opinions of authors expressed in this work do not necessarily state or reflect those of the United States Government, or its contractors, or subcontractors. Executive SummaryA research team is assessing the impacts of an innovative mercury treatment system in Tims Branch, a small southeastern stream. The treatment system, installed in 2007, reduces and removes inorganic mercury from water using tin(II) (stannous) chloride addition followed by air stripping. The system results in discharge of inorganic tin to the ecosystem. This screening study is based on historical information combined with measurements of contaminant concentrations in water, fish, sediment, biofilms and invertebrates. Initial mercury data indicate that first few years of mercury treatment resulted in a significant decrease in mercury concentration in an upper trophic level fish, redfin pickerel, at all sampling locations in the impacted reach. For example, the whole body mercury concentration in redfin pickerel collected from the most impacted pond decreased approximately 72% between 2006 (pre-treatment) and 2010 (post-treatment).Over this same period, mercury concentrations in the fillet of redfin pickerel in this pond were estimated to have decreased from approximately 1.45 g/g (wet weight basis) to 0.45 g/g -a decrease from 4.8x to 1.5x the current EPA guideline concentration for mercury in fillet (0.3 g/g). Thermodynamic modeling, scanning electron microscopy, and other sampling data for tin suggest that particulate tin (IV) oxides are a significant geochemical species entering the ecosystem with elevated levels of tin measured in surficial sediments and biofilms. Detectable increases in tin in sediments and biofilms extended approximately 3km from the discha...

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Methylation mechanism of tin(II) by methylcobalamin in aquatic systems

Cited by 13 publications

References 17 publications

Interim Results from a Study of the Impacts of Tin (II) Based Mercury Treatment in a Small Stream Ecosystem: Tims Branch, Savannah River Site

Interim Results from a Study of the Impacts of Tin (II) Based Mercury Treatment in a Small Stream Ecosystem: Tims Branch, Savannah River Site

Rapid and direct speciation of methyltins in seawater by an on-line coupled high performance liquid chromatography–hydride generation–ICP/MS system

Interim Results From a Study of the Impacts of Tin(ii) Based Mercury Treatment in a Small Stream Ecosystem: Tims Branch, Savannah River Site

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