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Impact of soil primary size fractions on sorption and desorption of atrazine on organo-mineral fractions

文献类型： 外文期刊

作者： Huang, Yufen 2 ; Liu, Zhongzhen 1 ; He, Yan 3 ; Li, Yanliang 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Key Lab Plant Nutr & Fertilizer South Reg, Minist Agr, Guangzhou 510640, Guangdong, Peoples R China

2.Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Guangdong Key Lab Nutrient Cycling & Farmland Con, Guangzhou 510640, Guangdong, Peoples R China

3.Zhejiang Univ, Coll Environm & Nat Resource Sci, Zhejiang Prov Key Lab Subtrop Soil & Plant Nutr, Ha

关键词： Atrazine;Adsorption;Desorption;Size fraction;Total organic carbon (TOC);Clay

期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：4.223； 五年影响因子：4.306 ）

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收录情况： SCI

摘要： In the current study, a mechanical dispersion method was employed to separate clay (<2 mu m), silt (2-20 mu m), and sand (20-50 mu m) fraction in six bulk soils. Batch equilibrium method was used to conduct atrazine sorption and desorption experiments on soil organo-mineral fractions with bulk soils and their contrasting size fractions separately. The potential contribution of total organic carbon (TOC) for atrazine retention in different fractions was further investigated. It was found that clay fraction had the highest adsorption but the least desorption capacities for atrazine, while sand fraction had the lowest adsorption but the highest desorption capacities for atrazine. The adsorption percentage of atrazine, as compared with adsorption by the corresponding bulk soils, ranged from 53.6 to 80.5 %, 35.7 to 56.4 %, and 0.2 to 4.5 % on the clay, silt, and sand fractions, respectively. TOC was one of the key factors affecting atrazine retention in soils, with the exact contribution dependent on varying degree of coating with mineral component in different soil size fractions. The current study may be useful to predict the bioavailability of atrazine in different soil size fractions.

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