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Antimony coordination to humic acid: Nuclear magnetic resonance and X-ray absorption fine structure spectroscopy study
Sh, Tserenpil; Liu, Cong-Qiang; Wang, Lihua(王丽华)
2012
Source PublicationMICROCHEMICAL JOURNAL
ISSN0026-265X
Volume103Pages:68
AbstractThis current study examined the fate of antimony (Sb) in the soil environment and its association with soil humic acid (HA). It is anticipated that a significant proportion of Sb is retained in soil organic layer; therefore, the oxidation state of Sb is controlled by the soil HA to some extent which influences Sb solubility and ecotoxicity. Parent HA material as well as prepared HA-Sb (III) composites was investigated by determining elemental composition and by performing nuclear magnetic resonance (NMR) and X-ray absorption fine structure (XAFS) spectroscopy study in order to study Sb coordination to natural macro organic ligand. The Sb (III) binding to soil derived HA mainly contributed to its open chains through carboxyl and hydroxyl moieties as revealed by the H-1 and solid state C-13 NMR spectroscopy. The protons in carboxylic and hydroxylic groups (those proton signals are characteristic of HAs with different origins) disappeared in the HA-Sb composite; and relative changes were observed in aliphatic proton distribution between the HA samples with and without Sb. The overall patterns of C-13 NMR spectra for the investigated samples were analogous to each other; moreover, it was estimated that the cyclic structure of the HA nucleus remained unchanged during Sb (III) association. Based on the absorption edge energy and coordination numbers, Sb oxidation state in a native soil was interpreted as pentavalent, meanwhile the HA-Sb composite contained both Sb (III) and Sb (V). It was shown that HA catalyzes Sb (III) oxidation to Sb (V) but the process was relatively slow. However, XAFS spectra sensitivity was limited when studying the HA-Sb composite that was prepared from the isolated soil HA fraction, so only data on the first shell Sb-O coordination were interpreted. (C) 2012 Elsevier B.V. All rights reserved.
Indexed BySCI
Language英语
Funding Project应物所项目组
WOS IDWOS:000304025200008
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/12890
Collection中科院上海应用物理研究所2011-2020年
Recommended Citation
GB/T 7714
Sh, Tserenpil,Liu, Cong-Qiang,Wang, Lihua. Antimony coordination to humic acid: Nuclear magnetic resonance and X-ray absorption fine structure spectroscopy study[J]. MICROCHEMICAL JOURNAL,2012,103:68.
APA Sh, Tserenpil,Liu, Cong-Qiang,&Wang, Lihua.(2012).Antimony coordination to humic acid: Nuclear magnetic resonance and X-ray absorption fine structure spectroscopy study.MICROCHEMICAL JOURNAL,103,68.
MLA Sh, Tserenpil,et al."Antimony coordination to humic acid: Nuclear magnetic resonance and X-ray absorption fine structure spectroscopy study".MICROCHEMICAL JOURNAL 103(2012):68.
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