Pilot study of temporal variations in lead bioaccessibility and chemical fractionation in some Chinese soils

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 城市与区域生态国家重点实验室

	Pilot study of temporal variations in lead bioaccessibility and chemical fractionation in some Chinese soils
	Tang, Xiang-Yu ; Cui, Yan-Shan ; Duan, Jing ; Tang, Lily
刊名	JOURNAL OF HAZARDOUS MATERIALS
	2008-12-15
卷号	160 期号:1 页码:29-36
关键词	Lead Soil Ageing Bioaccessibility Sequential extraction
英文摘要	The effect of ageing, following the addition of similar to 400 mg kg(-1) lead (Pb) as Pb(NO(3))(2), on Pb bioaccessibility was examined in five typical Chinese soils using a physiologically based extraction test. Sequential extraction was employed to identify the source fraction(s) of bioaccessible Pb in the soils. Pb bioaccessibility decreased exponentially to nearly steady levels in mildly acidic or alkali (pH 6.09-7.43) soils, for both gastric (69.91-71.75%) and small intestinal (7.53-9.63%) phases within the first 2-4 weeks and 1-2 months of incubation, respectively; however, it took only 1-2 weeks for strongly acidic (approximate to pH 4.5) soils to reach nearly steady levels of Pb bioaccessibility (73.01-74.46% and 10.30-10.98% in the gastric and small intestinal phases, respectively). In addition to the water-soluble and exchangeable fractions, the carbonate fraction of mildly acidic or alkali soils appeared to be a third main source of bioaccessible Pb in the small intestinal phase; however, bioaccessible Pb was likely to derive principally from Pb in the water-soluble and exchangeable fractions of strongly acidic soils. Bioaccessible Pb in the gastric phase appeared to derive from all the fractions in all five studied soils, even the residual fraction. (c) 2008 Elsevier B.V. All rights reserved.
WOS记录号	WOS:000261255100005
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/21851]
专题	生态环境研究中心_城市与区域生态国家重点实验室
推荐引用方式 GB/T 7714	Tang, Xiang-Yu,Cui, Yan-Shan,Duan, Jing,et al. Pilot study of temporal variations in lead bioaccessibility and chemical fractionation in some Chinese soils[J]. JOURNAL OF HAZARDOUS MATERIALS,2008,160(1):29-36.
APA	Tang, Xiang-Yu,Cui, Yan-Shan,Duan, Jing,&Tang, Lily.(2008).Pilot study of temporal variations in lead bioaccessibility and chemical fractionation in some Chinese soils.JOURNAL OF HAZARDOUS MATERIALS,160(1),29-36.
MLA	Tang, Xiang-Yu,et al."Pilot study of temporal variations in lead bioaccessibility and chemical fractionation in some Chinese soils".JOURNAL OF HAZARDOUS MATERIALS 160.1(2008):29-36.