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Soil humic acids may favour the persistence of hexavalent chromium in soil |
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| Authors: | Liviana Leita Alja Margon Iztok Ar?on Marco Contin |
| Institution: | a A.R.C. Agricultural Research Council-Research Group on Soil-Plant Systems, Via Trieste 23, 34170 Gorizia, Italy b University of Nova Gorica, Vipavska 13, SI-5000 Nova Gorica, Slovenia c Jo?ef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia d Dipartimento di Scienze Agrarie e Ambientali, University of Udine, Via delle Scienze 208, 33100 Udine, Italy |
| Abstract: | The interaction between hexavalent chromium Cr(VI), as K2CrO4, and standard humic acids (HAs) in bulk solution was studied using three complementary analytical methods: UV-Visible spectroscopy, X-ray absorption spectroscopy and differential pulse stripping voltammetry. The observed UV-Vis and X-ray absorption spectra showed that, under our experimental conditions, HAs did not induce reduction of Cr(VI) to its trivalent chemical form. The interaction between Cr(VI) and HAs has rather led to the formation of Cr(VI)-HAs micelles via supramolecular chemical processes. The reported results could contribute towards explaining the relative persistence of ecotoxic hexavalent chromium in soils. |
| Keywords: | Chromium Humic acids UV-Vis spectroscopy Differential pulse voltammetry X-ray absorption spectroscopy |
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