A biotic ligand model predicting acute copper toxicity for barley (Hordeum vulgare): Influence of calcium, magnesium, sodium, potassium and pH

文献类型： 外文期刊

第一作者： Ma, Yibing

作者： Ma, Yibing;Wang, Xuedong;Hua, Luo

作者机构：

关键词： copper;toxicity;barley;biotic ligand model (BLM)

期刊名称：CHEMOSPHERE （ 影响因子：7.086； 五年影响因子：6.956 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： The effects of selected cations and pH on the acute toxicity of copper (Cu) to barley root elongation were investigated to develop an appropriate biotic ligand model (BLM). The results showed that increasing activities of Mg~(2+) and Ca~(2+), but not Na~+ and 10, linearly increased the EC50 (as Cu~(2+) activity). Unchanged EC50 at solution pH less than 6.5 and sharply decreased EC50 with increasing of solution pH when greater than 6.5 can be explained by toxicity of the CuHCO_3~+, CuCO_3(aq) and CuOH~+ complexes. Conditional binding constants were obtained for the binding of Cu~(2+), CuHCO_3~+, CuCO_3(aq), CuOH~+, Mg~(2+) and Ca~(2+) with biotic ligand: logK_(CuBL) 6.33, log_(CuHCO_3BL) 5.71, logK_(CuHCO_3BL) 5.70, logK_(CuOHBL) 6039, log_(MgBL) 2.92 and logK_(CaBL) 1.96. Using the estimated constants, a BLM was successfully developed to predict Cu toxicity to barley root elongation as a function of solution characteristics.

分类号： X5

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