Comparison of synthetic chelators and low molecular weight organic acids in enhancing phytoextraction of heavy metals by two ecotypes of Sedum alfredii Hance

被引：101

作者：

Liu, Dan ^{[1
,2
]}

Islam, Ejazul ^{[1
,3
]}

Li, Tingqiang ^{[1
]}

Yang, Xiaoe ^{[1
]}

Jin, Xiaofen ^{[1
]}

Mahmood, Qaisar ^{[1
]}

机构：

[1] Zhejiang Univ, MOE Key Lab Environm Remediat & Ecosyst Hlth, Coll Nat Resources & Environm Sci, Hangzhou 310029, Peoples R China

[2] Zhejiang Forestry Coll, Sch Tourism & Hlth, Linan 311300, Peoples R China

[3] Nucl Inst Agr, Tandojam, Hyderabad, Pakistan

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2008年 / 153卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

heavy metals; low molecular weight organic acids; phytoextraction; Sedum allredii Hance; synthetic chelators;

D O I：

10.1016/j.jhazmat.2007.08.026

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Lab scale and pot experiments were conducted to compare the effects of synthetic chelators and low molecular weight organic acids (LMWOA) on the phytoextraction of multi-contaminated soils by two ecotypes of Sedum alfredii Hance. Through lab scale experiments, the treatment dosage of 5 and 10 mM for synthetic chelators and LMWOA, respectively, and the treatment time of 10 days were selected for pot experiment. In pot experiment, the hyperaccumulating ecotype (HE) was found more tolerant to the metal toxicity compared with the non-hyperaccumulating ecotype (NHE). EDTA for Pb, EDDS for Cu, and DTPA for Cu and Cd were found more effective to enhance heavy metal accumulation in the shoots of S. alfredii Hance. Compared with synthetic chelators, the phytoextraction ability of LMWOA was lesser. Considering the strong post-harvest effects of synthetic chelators, it is suggested that higher dosage of LMWOA could be practiced during phytoextraction, and some additional measures could also be taken to lower the potential environmental risks of synthetic chelators in the future studies. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：114 / 122

页数：9