Adsorption and absorption of dichlorodiphenyltrichloroethane (DDT) and metabolites (DDD and DDE) by rice roots

被引：22

作者：

Chen, S. H. ^{[1
]}

Xu, F. L. ^{[1
]}

Dawson, R. ^{[1
]}

Jiao, X. C. ^{[1
]}

Tao, S. ^{[1
]}

机构：

[1] Peking Univ, Coll Environm Sci, Lab Earth Surface Proc, Beijing 100871, Peoples R China

来源：

ENVIRONMENTAL POLLUTION | 2007年 / 147卷 / 01期

基金：

中国国家自然科学基金;

关键词：

DDT; adsorption; absorption; rhizosphere; rice; roots;

D O I：

10.1016/j.envpol.2006.08.034

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A three-step sequential extraction procedure was applied to measure the concentrations of dichlorodiphenyltrichloroethane (DDT) on rice root surface and in root tissues collected from two sites in Tianjin. Bulk and rhizosphere soils were also analyzed. The measured DDXs in the rhizosphere soils were significantly higher than those in the bulk soils. On average, p,p'-DDT, p,p'-DDD, and p,p'-DDE in the soil accounted for 38%, 47% and 15% of the total. For total DDXs, approximately one third remained on the outer surface of the roots. The partition of DDXs between rhizosphere soil and root surface depend on contaminant affinity to soil organic matter, soil organic matter content and root specific area. A case specific equation was developed to quantitatively describe the partition of DDXs between soil and root surface. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：256 / 261

页数：6

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