Effects of exogenous chelators on phytoavailability and toxicity of Pb in Zinnia elegans Jacq.

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	Effects of exogenous chelators on phytoavailability and toxicity of Pb in Zinnia elegans Jacq.
	Cui, S; Zhou, QX; Wei, SH; Zhang, W; Cao, L; Ren, LP; Zhou, QX, Chinese Acad Sci, Inst Appl Ecol, Key Lab Terr Ecol Proc, Shenyang 110016, Peoples R China
刊名	JOURNAL OF HAZARDOUS MATERIALS
	2007
卷号	146 期号:1-2 页码:341-346
关键词	Chelator Lead Phytoremediation Uptake Germination Test
ISSN号	0304-3894
英文摘要	Chelate-enhanced phytoremediation is considered as an effective method for the extraction of lead (Pb) by plants. However, more detailed studies are needed to evaluate the effect of exogenous chelators on phytoavailability and toxicity of Pb in plants, then to find out the proper applied concentration of chelators to minimize the combined toxicity to the plants and maximize phytoavailable Pb. To clarify these questions, the seed germination test of Zinnia elegans Jacq. exposed to solutions containing Pb and four types of chelators including sodium ethylenediamine tetra-acetic acid (Na(2)EDTA), oxalic acid, tartaric acid and citric acid was observed. The results showed that the roots and shoots treated with equimolar chelators and Pb were longer than those treated with half and two folds of the molar concentrations of Pb. The growth of seedlings was inhibited by surplus addition of chelators, and the toxicity of complexes was less than that of Ph and chelators. In particular, 2.4 mM EDTA and 1.2 mM oxalic acid significantly (P < 0.05) increased Pb uptake when the seeds were treated with 2.4 MM Pb. In the 4.8 mM Pb solution, Ph accumulation in the seedlings was markedly (P < 0.05) increased by 4.8 mM EDTA, 2.4 mM tartaric acid, 4.8 mM tartaric acid and 2.4 mM citric acid, and amounted to 6752.4, 6453.8, 6541.4 and 6598.3 mu g g(-1), respectively. With the superfluous addition of chelators, Pb accumulation in the seedlings decreased in a concentration-dependent manner. When Ph was used at 2.4mM, an equimolar concentration of EDTA not only increased Pb uptake but also stimulated the seedling growth. Thus, chelating agents in their appropriately concentrations could counteract Pb toxicity, but superfluous chelators resulted in less Ph uptake and growth inhibition of the seedlings. (C) 2006 Elsevier B.V. All rights reserved.
学科主题	Engineering, Environmental ; Engineering, Civil ; Environmental Sciences
语种	英语
WOS记录号	WOS:000248159700044
公开日期	2011-09-23
内容类型	期刊论文
源URL	[http://210.72.129.5/handle/321005/54655]
专题	沈阳应用生态研究所_沈阳应用生态研究所
通讯作者	Zhou, QX, Chinese Acad Sci, Inst Appl Ecol, Key Lab Terr Ecol Proc, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Cui, S,Zhou, QX,Wei, SH,et al. Effects of exogenous chelators on phytoavailability and toxicity of Pb in Zinnia elegans Jacq.[J]. JOURNAL OF HAZARDOUS MATERIALS,2007,146(1-2):341-346.
APA	Cui, S.,Zhou, QX.,Wei, SH.,Zhang, W.,Cao, L.,...&Zhou, QX, Chinese Acad Sci, Inst Appl Ecol, Key Lab Terr Ecol Proc, Shenyang 110016, Peoples R China.(2007).Effects of exogenous chelators on phytoavailability and toxicity of Pb in Zinnia elegans Jacq..JOURNAL OF HAZARDOUS MATERIALS,146(1-2),341-346.
MLA	Cui, S,et al."Effects of exogenous chelators on phytoavailability and toxicity of Pb in Zinnia elegans Jacq.".JOURNAL OF HAZARDOUS MATERIALS 146.1-2(2007):341-346.