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首页> 外文会议>Biogeochemistry of Trace Elements: Environmental Protection, Remediation and Human Health international Symposium >Kinetics of cadmium desorption by organic acids in minerals and soils
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Kinetics of cadmium desorption by organic acids in minerals and soils

机译：矿物和土壤中有机酸对镉的解吸动力学

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摘要

The kinetic characteristics of Cd desorption by organic acids in minerals and soils were studied using a flow-stirred method. It showed that the mechanism of Cd desorption could be ion exchange and dissolution of H, and the competition of organic ligands with colloids for Cd when organic acids were added as exterior protons and organic anions. Cd desorption could be divided into a fast reaction and a slow reaction. The reactions would be close to a quasi-equilibrium in 40~50min in red soil and goethite, and did not reach the stead state in latosol and kaolinite during the reaction time. Cd desorption could be well described by the double exponential equation. Except for H exchange and dissolution, the different organic ligands could compete with colloid surface for Cd and would lead to the difference of Cd desorption rate and amounts.
机译：利用流动搅拌法研究了有机酸在矿物和土壤中对Cd的解吸动力学。结果表明，当有机酸作为外质子和有机阴离子加入时，镉的解吸机理可能是离子的交换和氢的溶解，以及有机配体与胶体对镉的竞争。镉的解吸可以分为快速反应和缓慢反应。在红壤和针铁矿中，在40〜50min内反应接近于准平衡，在反应期间，在Latosol和高岭石中未达到稳态。镉的解吸可以用双指数方程很好地描述。除了氢的交换和溶解，不同的有机配体可以与胶体表面竞争镉，并导致镉的解吸速率和吸附量的差异。

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