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Title: Mercury fractionation in tropical soils: A critical point of view
Keywords: Model compounds
Sequential chemical extraction
Single chemical extraction
Mercúrio - Fracionamento
Extração química
Issue Date: Oct-2020
Publisher: Elsevier
Citation: VASQUES, I. C. F. et al. Mercury fractionation in tropical soils: A critical point of view. Chemosphere, [S. I.], v. 257, Sept. 2020. DOI:
Abstract: Problems related to specificity and re-precipitation of metals in sequential chemical extractions can impair their routine use. In order to test the efficiency of a sequential chemical procedure, model compounds composed by soil components commonly found in tropical soils such as goethite, Al-goethite, ferrihydrite, hematite, bauxite, and humic acid were incubated with either Hg(NO3)2 or HgSO4 and submitted to chemical extraction. The procedure aims to assess: (i) water soluble Hg; (ii) bioaccessible Hg at pH near human stomach; (iii) Hg associated with organic matter; (iv) reduced Hg; (v) Hg associated with Fe, Al, and Mn oxides; and, (vi) residual Hg. This procedure was also tested via single and sequential extractions using the surface and subsurface samples of two tropical soils, i.e., a Rhodic Acrudox and a Typic Hapludox, with and without lime application. Soil samples were submitted to an adsorption experiment with HgCl2 and a high adsorption percentage was observed. The majority of Hg at both single and sequential procedure was extracted by an acetic acid solution (pH = 2). Liming, soil depth, and soil type were not determinative on Hg extractability. The sequential extraction applied showed a lack specificity of Hg fractions, confirmed by the model components.
Appears in Collections:DCS - Artigos publicados em periódicos

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