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

被引：52

作者：

Wang, Xuedong ^{[2
]}

Hua, Luo ^{[2
]}

Ma, Yibing ^{[1
]}

机构：

[1] Chinese Acad Agr Sci, Minist Agr, Key Lab Plant Nutr & Nutrient Cycling, Beijing 100081, Peoples R China

[2] Capital Normal Univ, Coll Resource Environm & Tourism, Beijing 100048, Peoples R China

来源：

CHEMOSPHERE | 2012年 / 89卷 / 01期

基金：

北京市自然科学基金;

关键词：

Copper; Toxicity; Barley; Biotic ligand model (BLM); DISSOLVED ORGANIC-CARBON; ACUTE ZINC TOXICITY; FREE-ION ACTIVITY; DAPHNIA-MAGNA; ROOT ELONGATION; WATER CHEMISTRY; SOIL; VALIDATION; HARDNESS; METALS;

D O I：

10.1016/j.chemosphere.2012.04.022

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

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 Mg2+ and Ca2+, but not Na+ and K+, linearly increased the EC50 (as Cu2+ 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 CuHCO3,+ CuCO3(aq) and CuOH+ complexes. Conditional binding constants were obtained for the binding of Cu2+, CuHCO3+, CuCO3(aq), CuOH+, Mg2+ and Ca2+ with biotic ligand: log K-CuBL 6.33, log K-CuHCO3BL 5.71, log K-CuCO3BL 5.70, log K-CuOHBL 6.39, log K-MgBL 2.92 and log K-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. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：89 / 95

页数：7

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