Re-evaluating the effects of organic ligands on copper toxicity to barley root elongation in culture solution

文献类型： 外文期刊

第一作者： Guo, Xueyan

作者： Guo, Xueyan;Ma, Yibing;Chen, Shibao;Wang, Xuedong

作者机构：

关键词： copper;organic complexes;speciation;bioassays

期刊名称：CHEMICAL SPECIATION AND BIOAVAILABILITY （ 影响因子：2.077； 五年影响因子：2.413 ）

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年卷期：

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收录情况： SCI

摘要： In the presence of weak ligands, both free ion activity and organic complexes of Cu should be considered when predicting Cu toxicity in aquatic and soil-plant systems. However, there is little information about the quantitative contribution of Cu that is organically complexed to Cu toxicity. In this study, a bioassay using barley root elongation in culture solution was used to investigate the effects of organic ligands with different conditional stability constants on Cu toxicity and the quantitative contribution of the organically complexed Cu to the Cu toxicity. The results indicated that a significant decrease (p<0.05) in Cu toxicity, assessed by barley root elongation, was observed in response to the addition of organic ligands. The decrease differed, to some extent, with different organic ligands of disodium ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), oxalate and malate at low and constant free Cu2+ activity. Addition of EDTA or NTA resulted in strong reduction of Cu toxicity, while modest reduction of Cu toxicity was observed for the addition of malate as the relatively weak ligand. Furthermore, the results of the present study revealed that the CuNTA(-) and CuEDTA(2-) complexes were not toxic, while the Cu-malate complexes were mildly toxic to barley root elongation. More importantly, it was found that the toxicity of Cu-malate complexes were nearly 0.5-fold less than that of free Cu2+ ions.

分类号： X5

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