The ageing effect on the bioaccessibility and fractionation of arsenic in soils from China

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境化学与生态毒理学国家重点实验室

	The ageing effect on the bioaccessibility and fractionation of arsenic in soils from China
	Tang, Xiang-Yu ; Zhu, Yong-Guan ; Shan, Xiao-Quan ; McLaren, Ron ; Duan, Jing
刊名	CHEMOSPHERE
	2007-01
卷号	66 期号:7 页码:1183-1190
关键词	arsenic ageing process in vitro test sequential extraction procedure
英文摘要	Ingestion of contaminated soil has been recognized as an important exposure pathway of arsenic for humans, especially for children through outdoor hand-to-mouth activities. An improved sequential extraction procedure was employed in an attempt to reveal the relationship between bioaccessibility and fractionation of As in five soils from China. Arsenic bioaccessibility in acidic (approximate to pH 4.5) soils reached approximately stable levels after a sharp decline within one week of ageing. In contrast, As bioaccessibility in higher pH (> 6.0) soils was found to be significantly higher and took two weeks of ageing to reach stable levels. The artificially added As was more labile than indigenous As. The main proportions of added As were found in the specifically sorbed and amorphous and poorly-crystal line hydrous Fe/Al oxide-bound fractions. Correlation analysis shows that the non-specifically and specifically sorbed As are likely to constitute the main proportion of bioaccessible soil As. The soil content of amorphous and crystalline Fe/Al oxides and soil pH appear to be the key factors controlling, not only the time needed to reach a steady state, but also the magnitude of the bioaccessibility of As added to the soils. (c) 2006 Elsevier Ltd. All rights reserved.
WOS记录号	WOS:000244062700003
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/22513]
专题	生态环境研究中心_环境化学与生态毒理学国家重点实验室
推荐引用方式 GB/T 7714	Tang, Xiang-Yu,Zhu, Yong-Guan,Shan, Xiao-Quan,et al. The ageing effect on the bioaccessibility and fractionation of arsenic in soils from China[J]. CHEMOSPHERE,2007,66(7):1183-1190.
APA	Tang, Xiang-Yu,Zhu, Yong-Guan,Shan, Xiao-Quan,McLaren, Ron,&Duan, Jing.(2007).The ageing effect on the bioaccessibility and fractionation of arsenic in soils from China.CHEMOSPHERE,66(7),1183-1190.
MLA	Tang, Xiang-Yu,et al."The ageing effect on the bioaccessibility and fractionation of arsenic in soils from China".CHEMOSPHERE 66.7(2007):1183-1190.