Time effect on the fractionation of heavy metals in soils

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

	Time effect on the fractionation of heavy metals in soils
	Lu, AX; Zhang, SZ; Shan, XQ
刊名	GEODERMA
	2005
卷号	125 期号:2015-03-04 页码:225-234
关键词	time effect heavy metals fractionation soil
英文摘要	Time effect on the fractionation of Cu, Zn, Pb, and Cd in three typical Chinese soils was investigated. A total of 500 mg; kg(-1) of Cu, Zn, Pb and 2.5 mg kg-1 of Cd were added to soils as nitrates. Metals in the incubated soils were fractionated termly from 3 h to 8 weeks by the sequential extraction procedure, in which the metal fractions were experimentally defined as exchangeable, carbonate-, Fe-Mn oxide-, organic matter-bound and residual fractions. Results showed that the changes of Cu, Pb and Zn in fraction distribution were biphasic by an initial rapid step followed by a slow one. Metals in exchangeable fraction were increased in the first 3 h, and then decreased, such decreases could be simulated by a diffusion equation and the decrease rate followed the order Pb > Cu > Zn >> Cd. Metals bound to Fe-Mn oxides and organic matter increased consistently in the 8-week incubation. There were almost no changes for the metals in the residual fraction. After 3-h incubation most of Cd added to soils presented in the exchangeable fraction. The content of Cd in each fraction changed slightly in the 8-week incubation. Soil pH played an important role in metal fraction distribution patterns. Jiangxi soil, with low soil pH, tended to keep more metals added in exchangeable fraction and the changes of metals in each fraction were not as remarkable as in other two soils. High organic matter content resulted in the increased organic matter-bound fraction. (c) 2004 Elsevier B.V. All rights reserved.
学科主题	Agriculture
研究领域[WOS]	Agriculture
WOS记录号	WOS:000227504200004
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/23248]
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	Lu, AX,Zhang, SZ,Shan, XQ. Time effect on the fractionation of heavy metals in soils[J]. GEODERMA,2005,125(2015-03-04):225-234.
APA	Lu, AX,Zhang, SZ,&Shan, XQ.(2005).Time effect on the fractionation of heavy metals in soils.GEODERMA,125(2015-03-04),225-234.
MLA	Lu, AX,et al."Time effect on the fractionation of heavy metals in soils".GEODERMA 125.2015-03-04(2005):225-234.