STUDIES OF THE NATURE OF CU2+ AND PB2+ BINDING SITES IN SOIL HUMIC SUBSTANCES USING X-RAY ABSORPTION SPECTROSCOPY
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dc.contributor.author | Kang X. | |
dc.contributor.author | Bleam W. | |
dc.contributor.author | Helmke P.A. | |
dc.date.accessioned | 2020-12-15T04:58:28Z | |
dc.date.available | 2020-12-15T04:58:28Z | |
dc.date.issued | 1997 | |
dc.identifier | https://elibrary.ru/item.asp?id=273649 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 1997, , 11, 2211-2221 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/20832 | |
dc.description.abstract | We have investigated the binding environments of Cu2+ and Pb2+ complexed by soil humic substances using synchrotron-based X-ray absorption spectroscopy. With the assistance of bond network analysis, analysis of X-ray absorption near edge structure (XANES) and radial structure functions derived from extended X-ray absorption fine structure (EXAFS) spectra of Cu-humate at pH 4, 5, and 6 yielded a tetragonally-distorted octahedral binding environment for Cu with 4 O atoms at an average distance of 1.94 #9, 2 O atoms at an average distance of 2.02 #9, and 4 C atoms at an average distance of 3.13#9 . Analysis of Pb-humate samples at pH 4, 5, and 6 yielded 4 O atoms at average distances between 2.46 #9 to 2.32 #9 and 2 C atoms at an average distance of 3.26 #9 for Pb. We interpret the presence of C atoms in the second atomic shell of the metal binding site as evidence that both Cu2+ and Pb2+ form innersphere complexes with soil humic substances. Within the pH range 4-6, there is no significant change in the structure of the binding sites for either Cu or Pb. | |
dc.title | STUDIES OF THE NATURE OF CU2+ AND PB2+ BINDING SITES IN SOIL HUMIC SUBSTANCES USING X-RAY ABSORPTION SPECTROSCOPY | |
dc.type | Статья |
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