Development of a Multi-Species Biotic Ligand Model Predicting the Toxicity of Trivalent Chromium to Barley Root Elongation in Solution Culture

被引：19

作者：

Song, Ningning ^{[1
]}

Zhong, Xu ^{[1
]}

Li, Bo ^{[1
,2
]}

Li, Jumei ^{[1
]}

Wei, Dongpu ^{[1
]}

Ma, Yibing ^{[1
]}

机构：

[1] Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Natl Soil Fertil & Fertilizer Effects Long Term M, Beijing 100193, Peoples R China

[2] Liaoning Acad Agr Sci, Inst Plant Nutr & Environm Resources, Shenyang, Peoples R China

来源：

PLOS ONE | 2014年 / 9卷 / 08期

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

ACUTE COPPER TOXICITY; ACUTE ZINC TOXICITY; DAPHNIA-MAGNA; MAGNESIUM; SOIL; VALIDATION; POTASSIUM; CALCIUM; SODIUM; WHEAT;

D O I：

10.1371/journal.pone.0105174

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Little knowledge is available about the influence of cation competition and metal speciation on trivalent chromium (Cr(III)) toxicity. In the present study, the effects of pH and selected cations on the toxicity of trivalent chromium (Cr(III)) to barley (Hordeum vulgare) root elongation were investigated to develop an appropriate biotic ligand model (BLM). Results showed that the toxicity of Cr(III) decreased with increasing activity of Ca2+ and Mg2+ but not with K+ and Na+. The effect of pH on Cr(III) toxicity to barley root elongation could be explained by H+ competition with Cr3+ bound to a biotic ligand (BL) as well as by the concomitant toxicity of CrOH2+ in solution culture. Stability constants were obtained for the binding of Cr3+, CrOH2+, Ca2+, Mg2+ and H+ with binding ligand: log K-CrBL 7.34, log K-CrOHBL 5.35, log K-CaBL 2.64, log K-MgBL 2.98, and log K-HBL 4.74. On the basis of those estimated parameters, a BLM was successfully developed to predict Cr(III) toxicity to barley root elongation as a function of solution characteristics.

引用

页数：10

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