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2010•The Research of Environmental SciencesRequires access

Simulation of Organochlorine Pesticides Release Kinetics from Sediments of Honghu Lake

Xiangyi Gong, Shihua Qi, Chunling Lu, Qiuke Su

Open publisher page 1 citations

Abstract

The kinetic process of organochlorine pesticides(OCPs) release from the surface sediments from Honghu Lake in a suspended state was studied experimentally.The results showed that the sediments released OCPs fast at the beginning of the experiment,but then the release rate slowed down.The amount of OCPs released in the sediments was mainly controlled by the water solubility of the compounds.The compounds with higher water solubility,such as α-HCH,had higher release concentrations and longer release times.Moreover,temperature had an important influence on the release of OCPs.The release of OCPs in the sediments was enhanced by the increase of temperature.A first-order desorption kinetic model of OCPs from sediments was set up,and the model parameters were obtained.The model fit well with the experimental data.

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What this paper is about

The kinetic process of organochlorine pesticides(OCPs) release from the surface sediments from Honghu Lake in a suspended state was studied experimentally.The results showed that the sediments released OCPs fast at the beginning of the experiment,but then the release rate slowed down.The amount of OCPs released in the sediments was mainly controlled by the water solubility of the compounds.The compounds with higher water solubility,such as α-HCH,had higher release concentrations and longer release times.Moreover,temperature had an important influence on the release of OCPs.The release of OCPs in the sediments was enhanced by the increase of temperature.A first-order desorption kinetic model of OCPs from sediments was set up,and the model parameters were obtained.The model fit well with the experimental data.

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Available abstract

The kinetic process of organochlorine pesticides(OCPs) release from the surface sediments from Honghu Lake in a suspended state was studied experimentally.The results showed that the sediments released OCPs fast at the beginning of the experiment,but then the release rate slowed down.The amount of OCPs released in the sediments was mainly controlled by the water solubility of the compounds.The compounds with higher water solubility,such as α-HCH,had higher release concentrations and longer release times.Moreover,temperature had an important influence on the release of OCPs.The release of OCPs in the sediments was enhanced by the increase of temperature.A first-order desorption kinetic model of OCPs from sediments was set up,and the model parameters were obtained.The model fit well with the experimental data.

Key concepts: Desorption, Environmental chemistry, Solubility, Chemistry, Organochlorine pesticide, Pesticide, Kinetics, Dissolution

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