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Kinetics and mechanism of copper release from selected agricultural calcareous soils of northern Iran.

机译：伊朗北部部分农业石灰质土壤中铜释放的动力学和机理。

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摘要

Availability of soil copper (Cu) to plants is dependent on the release into the soil solution of Cu from the solid phases. To ascertain the pattern of Cu release and the soil characteristics affecting it, the kinetics of Cu release by diethylenetriaminepentaacetic acid (DTPA) from 14 calcareous soils of northern Iran was investigated using six kinetic models. The release pattern was generally characterised by an initial fast reaction followed by a slower reaction that continued up to 192 h. The kinetic data were best described by the power function equation as evidenced by relatively high values of the coefficient of determination (R2) and relatively low values of the standard error of the estimate. The Cu release pattern based on the parabolic diffusion equation suggested the possible involvement of two different mechanisms. Conformity of the shell progressive particle diffusion equation to kinetic data may indicate that the release rate is controlled by diffusion of Cu and/or DTPA molecules through a reacted soil particle or aggregate rather than diffusion through the film surrounding soil particles. Rate constants for the power function equation (a and b), the parabolic diffusion equation (k'p), and the initial release rate (ab) were closely associated with cation exchange capacity (CEC). From results reported herein, CEC seems to be the most important influencing factor in controlling Cu release from calcareous soils of northern Iran.
机译：植物对土壤铜（Cu）的可用性取决于固相中铜在土壤溶液中的释放。为了确定Cu释放的模式和影响其的土壤特性，使用六个动力学模型研究了二亚乙基三胺五乙酸（DTPA）从伊朗北部14个石灰质土壤中释放Cu的动力学。释放模式的特征通常是最初的快速反应，然后是缓慢的反应，持续长达192小时。动力学数据最好用幂函数方程来描述，这由相对较高的测定系数值（ R 2 ）和相对较低的标准误差值证明。估计。基于抛物线扩散方程的铜释放模式表明可能涉及两种不同的机制。壳层渐进颗粒扩散方程与动力学数据的一致性可能表明释放速率受Cu和/或DTPA分子通过反应的土壤颗粒或聚集体的扩散而不是通过周围土壤颗粒的膜的扩散控制。幂函数方程（ a 和 b ），抛物线扩散方程（ k' p ）和初始释放速率（ ab ）与阳离子交换容量（CEC）密切相关。根据本文报道的结果，CEC似乎是控制伊朗北部钙质土壤中Cu释放的最重要影响因素。

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