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- W2187974309 abstract "Potential binding ability of mercury (Hg) to soil is an important aspect in selecting bioremediation technologies. Two studies were carried out to evaluate affinity of Hg to soil organic carbon. The first study was conducted with soil samples obtained from Hg-contaminated areas close to the Department of Energy Site at Oak Ridge, Tennessee. The soil samples were analyzed for total Hg and total organic carbon (TOC), and later tested for Hg desorption in aqueous phase. The second study was conducted using peat (Sphagnum moss) as a carbon source for sorption of Hg in the aqueous phase. The study was undertaken as a confirmatory test to understand the interaction of Hg with the organic carbon under controlled conditions. Both studies revealed higher degree of association of Hg with peat/soil organic carbon, for a given condition. The soil samples were found to contain higher concentrations of Hg with increasing percentages of TOC in the soil. The soils with TOC of 1.18% and 6.05% had total Hg concentrations of 0.92 and 436 parts per million (ppm), respectively. Furthermore, desorption of Hg from the contaminated soils was directly related to TOC content of the soil. The results revealed an inverse relationship between Hg desorption from the soil and the TOC content of the soil, thus indicating the role of soil organic carbon in binding and retaining Hg in the soil. In a similar way, Hg sorption on peat substrate increased with increasing concentrations of Hg in the aqueous phase, thus showing a high affinity of Hg towards organic carbon. The ratio of the initial to final concentrations of Hg in the aqueous phase was as high as 144.09 for the experiments conducted at 0.50 ppm aqueous Hg concentration. Such Hg-TOC relationships might have a significant impact on the bioavailability of Hg in soils, hence on the ability of microorganisms or plants to uptake, transform or mobilize Hg during remediation process." @default.
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- W2187974309 date "2010-01-01" @default.
- W2187974309 modified "2023-09-24" @default.
- W2187974309 title "The role of organic carbon in facilitating mercury sorption and retention in the soil: Some field evidence from Oak Ridge, Tennessee- 10391" @default.
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