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adsorption–desorption behavior of atrazine on agricultural soils in China

Journal of Environmental Sciences 2017年第7期29卷 180-189页

作者： Lin Yue ChengJun Ge Dan Feng Huamei Yu Hui Deng Bomin Fu School of Environment and Plant Protection Hainan UniversityHaikou 570228China Key Laboratory of Protection and Development Utilization of Tropical Crop Germplasm Resources(Hainan University) Ministry of EducationHaikou 570228HainanChina

adsorption and desorption are important processes that affect atrazine transport,transformation,and bioavailability in *** this study,the adsorption–desorption characteristics of atrazine in three soils（laterite,paddy soil and alluvial soil） were evaluated using the batch equilibrium *** results showed that the kinetics of atrazine in soils was completed in two steps：a＂fast＂ adsorption and a ＂slow＂ adsorption and could be well described by pseudo-second-order *** addition,the adsorption equilibrium isotherms were nonlinear and were well fitted by Freundlich and Langmuir *** was found that the adsorption data on laterite,and paddy soil were better fitted by the Freundlich model;as for alluvial soil,the Langmuir model described it *** maximum atrazine sorption capacities ranked as follows：paddy soil 〉 alluvial soil 〉 *** of thermodynamic calculations indicated that atrazine adsorption on three tested soils was spontaneous and *** desorption data showed that negative hysteresis ***,lower solution pH value was conducive to the adsorption of atrazine in *** atrazine adsorption in these three tested soils was controlled by physical adsorption,including partition and surface *** lower equilibrium concentration,the atrazine adsorption process in soils was dominated by surface adsorption;while with the increase of equilibrium concentration,partition was predominant.

关键词： atrazine adsorption desorption agricultural soils

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