Development of a biotic ligand model for acute zinc toxicity to barley root elongation

文献类型： 外文期刊

第一作者： Li, Bo

作者： Li, Bo;Ma, Yibing;Wang, Xuedong;Hua, Luo

作者机构：

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

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.291； 五年影响因子：6.393 ）

ISSN：

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收录情况： SCI

摘要： The effects of pH and some cations on the acute toxicity of zinc (Zn) to barley (Hordeum vulgare) root elongation were investigated to aid the development of an appropriate biotic ligand model (BLM). The results showed that Zn toxicity decreased with increased activity of Mg~(2+) K~+ and Ca~(2+) but not Na~+. The effect of pH on Zn toxicity to barley root elongation could be explained by H~+ competition with Zn~(2+) bound to a biotic ligand (BL) at pH ≤ 6 and by the concomitant toxicity of ZnHCO_3~+ in solution culture at pH ≥ 6. Stability constants were obtained for the binding of Zn~(2+), ZnHCO_3~+, Mg~(2+) K~+, Ca~(2+) and H~+ with BL: logK_(ZnBL)4.06, log K_(ZnHCO_3BL+) 5.15, log K_(MgBL) 3.72, log K_(KBL) 2.62, log K_(CaBL) 1.99 and logK_(HBL) All. On the basis of these estimated parameters, a BLM was successfully developed to predict Zn toxicity to barley root elongation as a function of solution characteristics.

分类号： X

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