XAFS analysis of Arsenic bound in holocellulose extracted from organic-rich contaminated sediments

被引:0
|
作者
Hara, Junko [1 ]
Norota, Susumu [2 ]
机构
[1] Geol Survey Japan, Natl Inst Adv Ind Sci & Technol, Higashi 1-1-1, Tsukuba, Ibaraki 3058567, Japan
[2] Geol Survey Hokkaido, Environm & Geol Res Dept, Hokkaido Res Org, Kita Ku, Kita 19 Nishi11, Sapporo, Hokkaido 0600819, Japan
来源
16TH INTERNATIONAL SYMPOSIUM ON WATER-ROCK INTERACTION (WRI-16) AND 13TH INTERNATIONAL SYMPOSIUM ON APPLIED ISOTOPE GEOCHEMISTRY (1ST IAGC INTERNATIONAL CONFERENCE) | 2019年 / 98卷
关键词
MATTER; ASIA;
D O I
10.1051/e3sconf/20199809010
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The arsenic bound in holocellulose, a precursor of humic substances extracted from organic contaminated sediments, was investigated using XANES (x-ray adsorption near-edge structure) and EXAFS (extended x-ray absorption fine structure) with fluorescence mode. The most abundant arsenic bound in holocellulose was As-O in the first coordination sphere. Sulphur and carbon were also found in a neighbouring coordination shell around arsenic. The arsenic oxidation state was judged to be As (III) by As K edge XANES spectra as a shift to higher absorption edge energy with the increasing formal oxidation state. This arsenic speciation and bounding were well matched with biochemical mechanisms of arsenic absorption into plants.
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页数:4
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