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首页> 外文期刊>Journal of Environmental Science and Health. Part B, Pesticides, Food Contaminants and Agricultural Wastes >Correlations between experimental and predicted equilibrium distribution coefficient of chlorobenzene and chlorophenol compounds in soil-water systems using partial solubility parameters
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Correlations between experimental and predicted equilibrium distribution coefficient of chlorobenzene and chlorophenol compounds in soil-water systems using partial solubility parameters

机译:使用部分溶解度参数的土壤-水系统中氯苯和氯酚化合物的实验和预测平衡分配系数之间的相关性

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摘要

Many pesticides are degraded to become chlorinated aromatic compounds in soils. Equilibrium distribution of chlorobenzene and chlorophenol compounds in soil-water systems of Yangmingshan loam, Pingcheng silty clay loam and Annei silty loam was studied with the integral distribution equilibrium equation involving the partial solubility parameters of the chemicals. If the adsorption of chemicals on soils is partitioning in soil organic matter surrounding the soil mineral particles, the absorption constant (K_d) of a chemical in soil-water system could be stated as the distribution coefficient (or partition constant, K_(oc)) of the chemical in the two adjunct immiscible phases—water and soil organic matter. The distribution coefficient (K_(oc)) of chemicals calculated from the integral distribution equilibrium equation agrees well with the experimental adsorption coefficient (K_d, or experimental K_(oc)) of chemicals determined in this study, for all the three different types of soils in water according to multiple-regression analysis. Reference data of Karger or Tijssen are employed to estimate the K_(oc) for both polar and non-polar chemicals. The integral distribution equilibrium equation can exactly describe the distribution behavior of nonionic compound of chlorobenzenes and chlorophenols in soil-water systems.
机译:许多农药在土壤中降解为氯代芳族化合物。研究了阳明山壤土,平城粉质粘土质壤土和安妮粉质壤土在土壤-水系统中氯苯和氯酚化合物的平衡分布,并利用涉及该化学品部分溶解度参数的积分分布平衡方程进行了研究。如果化学物质在土壤上的吸附在土壤矿物质颗粒周围的土壤有机质中分配,则该化学物质在土壤-水系统中的吸收常数(K_d)可以表示为分配系数(或分配常数,K_(oc))在水和土壤有机质这两个附加的不混溶相中的化学成分。根据积分分布平衡方程计算出的化学物质的分布系数(K_(oc))与本研究确定的三种不同类型土壤的化学吸附系数(K_d,或实验K_(oc))吻合得很好根据多元回归分析分析水中采用Karger或Tijssen的参考数据估算极性和非极性化学品的K_(oc)。积分分布平衡方程可以准确地描述非离子型氯苯和氯酚在土壤-水系统中的分布行为。

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