KINETICS OF TRACE-METAL COMPLEXATION - ROLE OF ALKALINE-EARTH METALS

被引：132

作者：

HERING, JG ^{[1
]}

MOREL, FMM ^{[1
]}

机构：

[1] MIT,RALPH M PARSONS LAB,48-425,CAMBRIDGE,MA 02139

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 1988年 / 22卷 / 12期

关键词：

Acids - Alkaline earth metals - Chemical reactions--Reaction kinetics - Organic Chemicals--Chemical Reactions - Seawater;

D O I：

10.1021/es00177a014

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The rate of reaction of inorganic copper with the model ligand ethylenediaminetetraacetic acid (EDTA) is significantly retarded in the presence of calcium at seawater concentrations. The (pseudo-first-order) half-life for inorganic copper reacting with EDTA in seawater is about 2 h at 10-7 M EDTA. This kinetic hindrance to the formation of the thermodynamically favored CuEDTA species results from several factors: (1) the preponderance of the calcium complex in the speciation of EDTA, (2) the competition of calcium and copper for reaction with any free EDTA formed by the dissocation of CaEDTA, and (3) the slow kinetics of direct attack of copper on CaEDTA compared to reaction with free or protonated EDTA species. Additional study results are discussed.

引用

页码：1469 / 1478

页数：10

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