Characteristics and Effect Factors for the Sorption and Desorption of p,p'-DDT on Sediment of the Yellow River in Lanzhou
To study the characteristics of sorption and desorpfion is significantly for the environmental behavior and fate of hydrophobic organic contaminants. In this paper,the batch isotherm experiments were performed to study the characteristics and effect factors for the sorption and desorption of p,p'-DDT on sediment of the Yellow River in Lanzhou. The effect of environmental factors on the sorption of p,p'-DDT such as water temperature,pH value,particle sizes in sediments were investigated,respectively. Experimental results demonstrated that the sorption of p,p'-DDT in the sediments of the Yellow River in Lanzhou could be completely balanced in 24 h. The sorption isotherm was nonlinear and fitted with the form of the Freundlich equation at experimental condition,which suggested that both adsorption and partition occurred in the sorption process of p,p'-DDT at the same time. The desorption process of p,p'-DDT had an obvious hysteresis,and it was difficult for desorption than sorption. Furthermore,the affected degrees of different environmental factors were different for the sorption. The result of orthogonal experiment indicated that the sorption amount of p,p'-DDT was influenced by the initial concentrations of sorbate and sorbent obviously,sorption amount of p,p'-DDT exhibited an increased trend with the initial concentration of sorbatc and decreased trend with the concentration of sorbent,but no other significantly affected factors were obvious including such as water temperature,pH value,content of organic matter,ionic strength.
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