Correlations between experimental and predicted equilibrium distribution coefficient of chlorobenzene and chlorophenol compounds in soil-water systems using partial solubility parameters.
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 (Kd) of a chemical in soil-water system could be stated as the distribution coefficient (or partition constant, Koc) of the chemical in the two adjunct immiscible phases--water and soil organic matter. The distribution coefficient (Koc) of chemicals calculated from the integral distribution equilibrium equation agrees well with the experimental adsorption coefficient (Kd, or experimental Koc) 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 Koc 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.
Jaw
Ching-Guang
CG
Department of Environmental Engineering and Science, Fooyin University, Kaohsiung, Taiwan.
Lin
Kuo-Hsiung
KH
Yen
Jui-Hung
JH
Wang
Yei-Shung
YS
D000327:Adsorption; D002722:Chlorobenzenes / Q000032:analysis / Q000737:chemistry*; D002733:Chlorophenols / Q000032:analysis / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D007700:Kinetics; D010575:Pesticides / Q000032:analysis / Q000737:chemistry*; D012044:Regression Analysis; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry*; D012995:Solubility; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
D002722:Chlorobenzenes; D002733:Chlorophenols; D010575:Pesticides; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; C031294:chlorobenzene