Document Type : Research Paper
Abstract
Pesticides application can be leached to ground water or throughout runoff reach to water surface. The adsorption behavior of the river sediment with the pesticides has a significant influence on the environmental quality of a river. The objective of this research was to study the sorption isotherms of lindane pesticide on sediments of Ahvaz fifth bridge, Darkhoin and Khorramshahr hydrometric stations in two low water and high water seasons. Also, the effect of some chemical and physical properties on adsorption capability of sediments was investigated. The water and sediment samples used in this research were collected from downstream of the Karoon River. The results showed the salinity of water and sediments of the river in both seasons increased from Ahvaz to Khorramshahr. The highest percentages of OM and clay were 2.45 and 30.8, respectively, for Darkhoin and the lowest were 0.49 and 2.1 for Ahvaz fifth bridge station. The kf value of Lindane for Darkhoin sediments (195.5 mg/kg) was found to be highest and the lowest kf value (81.5 mg/kg) was observed in Ahvaz fifth bridge station. Langmuir b value for lindane was found to be 340 and 140 mg/kg for Darkhoin and Ahvaz fifth bridge station, respectively. Significant correlation was found between clay and organic matter percentage of sediments and amount of lindane adsorption.
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