Identification of Heavy Metal Compounds in Technogenically Transformed Soils Using Sequential Fractionation, XAFS Spectroscopy, and XRD Powder Diffraction
نویسندگان
چکیده
Abstract The transformation of technogenic Cu and Zn compounds in technogenically transformed soils (Spolic Technosols) with high very concentrations metals formed at the site a natural tailings pond floodplain Seversky Donets River, main tributary Don River (Rostov oblast, Russia) has been studied. Technosols are compared to an unpolluted meadow-chernozemic soil (Fluvisol) outside impact zone. state is assessed using three sequential extraction schemes—Miller’s, Tessier’s, BCR, as well synchrotron X-ray powder diffraction (XRD) analysis absorption spectrometry (XAFS) spectra. It shown that distribution largely related their properties, such electronegativity, hydrolyzability, softness parameter. As observed, mainly concentrates residual fraction (to 42%) associated organic matter (up 27%). mobility studied higher than Cu. Its part 56%) Fe Mn oxides 48%), especially Fe(III) crystalline compounds. combination three-stage BCR scheme XAFS XRD techniques used for first time. Most peaks patterns samples after second stages correspond authigenic sulfur-containing minerals, namely, wurtzite (ZnS hexagonal structure), sphalerite (cubic ZnS), covellite (CuS), bornite (Cu 5 FeS 4 ). Wurtzite present exchangeable reducible fractions. These fractions also contain chalcocite 2 S). Sulfides most abundant sample oxidizable fraction, while phyllosilicates prevalent fraction. spectroscopy demonstrates molecular structural changes heavily polluted soils, suggesting under different environmental conditions, which important assessment protective function.
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ژورنال
عنوان ژورنال: Eurasian Soil Science
سال: 2022
ISSN: ['1064-2293', '1556-195X']
DOI: https://doi.org/10.1134/s1064229322050076