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首页> 外文期刊>Journal of Agricultural and Food Chemistry >Determining kinetic and nonequilibrium sorption behavior for chlopyrifos using a hybrid batch/column experiment
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Determining kinetic and nonequilibrium sorption behavior for chlopyrifos using a hybrid batch/column experiment

机译：使用混合批/柱实验确定毒死rif的动力学和非平衡吸附行为

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摘要

Pesticide mobility in soil is strongly coupled to the chemical's sorption characteristics. A modified soil column batch experiment was conducted to measure the transient nature of chlorpyrifos sorption and desorption from Cecil soil. This experimental system minimizes many shortcomings associated with obtaining sorption parameters by fitting soil column data to an advective-dispersive transport equation. Several chlorpyrifos formulations were investigated to determine how formulations affect soil sorption, and if this effect is adequately described using transient sorption/desorption algorithms. Both a second-order sorption with first-order desorption kinetic model and the two-site kinetic/equilibrium model were found to yield reasonable comparisons to experimental observations. In general, the formulation temporarily decreases the sorptivity of chlorpyrifos and alters the time for equilibrium to be achieved. Care must be exercised when extrapolating sorption data for a pure molecule in a laboratory setting to formulated materials used in field applications when environmental fate predictions are sought.
机译：农药在土壤中的流动性与化学物质的吸附特性密切相关。进行了改良的土壤柱分批实验，以测定毒死rif从塞西尔土壤中吸附和解吸的瞬时性质。该实验系统通过将土壤柱数据拟合到对流-弥散运移方程，将与获得吸附参数有关的许多缺点降到最低。研究了几种毒死rif制剂，以确定它们如何影响土壤吸附，以及是否使用瞬态吸附/解吸算法充分描述了这种影响。发现具有一阶解吸动力学模型的二阶吸附和二位动力学/平衡模型都可以对实验结果进行合理的比较。通常，该制剂暂时降低了毒死rif的吸收性并改变了达到平衡所需的时间。当寻求环境命运预测时，在实验室环境中将纯分子的吸附数据外推到现场应用的配制材料时，必须格外小心。

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