Jih-Hsing Chang* and Hsiao-Chung Chen Department of Environmental Engineering and Management, Chaoyang University of Technology, Wufeng, Taichung County 413, Taiwan, R.O.C.
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The distribution of chlorophenols in the soil-water system has received great attention by many researchers. However, most of research was conducted at low organic concentrations.In fact, chlorophenols might be spilled to soil at high concentrations and the water content of most soils varies unpredictably.The objective of this study, therefore, was to analyze and illustrate the effects of solute concentration and soil concentration on the distribution of chlorophenols between the aqueous and soil phases. Batch sorption experiments were conducted with 4-chlorophenol and 2,4,6-trichlorophenol at various soil to solution ratios (by weight) ranging from 1:5 to 1:100. The initial concentrations of organic compounds ranged from 0.04Cs to 0.5Cs with Cs being the saturation water solubility.Langmuir model was employed as a general expression without the specific characteristics and molecular structures of the soil.According to experimental results of two target compounds, the adsorption density, q, increases with increasing the equilibrium concentrations, C, and both adsorption curves could be well fitted to the Langmuir model.Langmuir isotherms appropriately simulated the distribution behaviors of 4-chlorophenol and 2,4,6-chlorophenol throughout the whole range of saturation solubility.The fitted K values of individual chlorophenols maintained constant that implied an identical driving force, i.e. the hydrophobicity of chlorophenols, under different environmental conditions (pH values and soil concentrations).The higher soil concentration decreases the adsorption capacity of chlorophenols, which could be in analogy to the relevance between force and pressure.The magnitude order of adsorption capacities of 4-chlorophenol and 2,4,6-chlorophenol follows pH 5 > pH 7 > pH 9 > pH 11 > pH 3.ABSTRACT
Keywords:
sorption; chlorophenols; solute concentration; soil concentration; contamination.
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Accepted:
2003-04-02
Available Online:
2003-03-01
Chang, J.-H. Chen, H.-C.2003. Effects of solute and soil concentrations on the distribution of chlorophenols in the water-soil system, International Journal of Applied Science and Engineering, 1, 72–81. https://doi.org/10.6703/IJASE.2003.1(1).72
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