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- W2034978867 abstract "This paper reports on the speciation study and the Hg redox behavior in Amazon soils not influenced by gold mining and collected near Manaus, AM, Brazil. The samples were incubated by adding Hg(0) and HgCl2 to dry soil. Solid phase Hg speciation analysis was carried out using a Hg thermodesorption technique with the aim of distinguishing elemental Hg(0) from Hg(II) binding forms. In the first case, we observed the conversion of Hg(0) to Hg(II) binding forms in the range of 28–68% and a correlation between the percent of oxidation and OM content. Samples incubated with Hg(II) showed the formation of Hg(I) and/or Hg(0) in the range of 19–69%. The lowest values corresponded to the samples with the lowest clay contents. The kinetics of conversion of Hg(0) as well as HgCl2 were roughly fitted to the two first order reactions, a fast one and a slow one. It was not possible to evaluate differences between sampling sites and types of soils, but the mean half-life of the first order reaction obtained by the addition of Hg(II) was slower (t1/2 = 365 d) than the one obtained by the addition of Hg(0) (t1/2 = 148 d). Previous studies have shown the predominance of organically bound Hg in these samples. Thus, the kinetic difference between Hg oxidation and reduction in combination with the efficient retention processes by OM may explain the high background values found in Amazon soils." @default.
- W2034978867 created "2016-06-24" @default.
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- W2034978867 date "2006-12-01" @default.
- W2034978867 modified "2023-09-26" @default.
- W2034978867 title "Mercury conversion processes in Amazon soils evaluated by thermodesorption analysis" @default.
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- W2034978867 doi "https://doi.org/10.1016/j.chemosphere.2006.07.001" @default.
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