Adsorption Characteristics and Mechanisms of Organochlorine Pesticide DDT on Farmland Soils
Dongxiang Cheng1,2, Jitong Yu1, Tingting Wang1, Weiwei Chen1, Ping Guo1
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1Key Lab of Groundwater Resources and Environment, Ministry of Education,
College of Environment and Resources, Jilin University, Changchun 130012, China
2Nanjing Communication Institute of Technology, Nanjing 211188,China
Pol. J. Environ. Stud. 2014;23(5):1527–1535
The adsorption behavior and the adsorption mechanism of the persistent organic pollutant DDT existing extensively in soils around the world are the key to solve the DDT-contaminated soils. Hence, in this paper, selective extraction and batch experimental method were used to examine the adsorption of DDT on farmland soils H and S in Northeast China. Simultaneously, the parameters indicating soil properties and composition such as soil particle, organic matter, and minerals, ect. were analyzed. Results show that the shape and the best fitted model of adsorption isotherm of DDT in both soils were L-type and Freundlich model, respectively. Smaller soil particle had greater adsorption capacity to DDT. The effects of organic matter and minerals on the adsorption of DDT were related to the composition and the origin of organic matter and minerals. Both SiO2 and illite-montmorillorite mixed-layer could hardly adsorb DDT, and the iron oxides could adsorb DDT, while the function of manganese oxides was inhibitory of DDT adsorption. Organic matter had greater adsorption capacity to DDT than iron oxides. The adsorption capacity of the plant residues is the greatest, followed by the aromatic substances from the plant and the products from microbial degradation.