Arsenic sequestration in iron plaque, its accumulation and speciation in mature rice plants (Oryza sativa L.)

被引:368
作者
Liu, W. J.
Zhu, Y. G.
Hu, Y.
Williams, P. N.
Gault, A. G.
Meharg, A. A.
Charnock, J. M.
Smith, F. A.
机构
[1] Chinese Acad Sci, Ecoenvironm Sci Res Ctr, Beijing 100864, Peoples R China
[2] Hebei Agr Univ, Coll Resources & Environm Sci, Baoding, Hebei Province, Peoples R China
[3] Univ Aberdeen, Sch Biol Sci, Aberdeen AB24 3UU, Scotland
[4] Univ Manchester, Sch Earth Atmospher & Environm Sci, Manchester M13 9PL, Lancs, England
[5] Univ Manchester, Williamson Res Ctr Mol Environm Sci, Manchester M13 9PL, Lancs, England
[6] CCLRC, Daresbury Lab, Warrington WA4 4AD, Cheshire, England
[7] Univ Adelaide, Sch Earth & Environm Sci, Adelaide, SA 5005, Australia
基金
英国工程与自然科学研究理事会;
关键词
D O I
10.1021/es060800v
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A compartmented soil-glass bead culture system was used to investigate characteristics of iron plaque and arsenic accumulation and speciation in mature rice plants with different capacities of forming iron plaque on their roots. X-ray absorption near-edge structure spectra and extended X-ray absorption fine structure were utilized to identify the mineralogical characteristics of iron plaque and arsenic sequestration in plaque on the rice roots. Iron plaque was dominated by (oxyhydr)oxides, which were composed of ferrihydrite (81-100%), with a minor amount of goethite (19%) fitted in one of the samples. Sequential extraction and XANES data showed that arsenic in iron plaque was sequestered mainly with amorphous and crystalline iron (oxyhydr) oxides, and that arsenate was the predominant species. There was significant variation in iron plaque formation between genotypes, and the distribution of arsenic in different components of mature rice plants followed the following order: iron plaque > root > straw > husk > grain for all genotypes. Arsenic accumulation in grain differed significantly among genotypes. Inorganic arsenic and dimethylarsinic acid (DMA) were the main arsenic species in rice grain for six genotypes, and there were large genotypic differences in levels of DMA and inorganic arsenic in grain.
引用
收藏
页码:5730 / 5736
页数:7
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