氯嘧磺隆在土壤中的吸附-解吸特性研究  

Adsorption-desorption Characteristics of Chlorimuron-ethyl in Soils

作　　者：张伟[1] 王进军[1] 张忠明[2] 秦蓁[2] 

机构地区：[1]西南大学植物保护学院,重庆400716 [2]四川省农药检定所,成都610041

出　　处：《中国农业科学》2007年第8期1730-1737,共8页Scientia Agricultura Sinica

基　　金：教育部新世纪优秀人才支持计划(NCET-04-0854);重庆市科技创新能力建设项目(CSTC;2005CA1002)

摘　　要：【目的】对氯嘧磺隆在土壤中的等温吸附-解吸特性进行研究,为其安全使用及对水资源的风险性评价提供理论依据。【方法】采用平衡振荡法和液相色谱法测定氯嘧磺隆在土壤中的吸附-解吸行为,并运用5种数学模型对其在土壤中的吸附-解吸特性及迁移性能进行分析。【结果】氯嘧磺隆等温吸附-解吸曲线符合Freundlich模型,其吸附以物理作用为主,吸附常数(Kads-f)在0.740～9.703之间,其中在2#(江西黏壤土)和3#(江西砂壤土)土壤中的等温吸附线属S型等温吸附线,而在其他土壤中属L型等温吸附线;其解吸存在滞后现象,滞后系数(H)在0.259～0.980之间。此外,Kads-f和解析常数(Kf-des)与土壤有机质含量和黏土含量呈正相关,而与土壤pH值呈负相关,H与有机质含量和黏土含量呈负相关。【结论】氯嘧磺隆在土壤中具有较低的吸附值,在土壤中具有一定的迁移能力,对水体存在风险。土壤有机质含量、黏土含量和pH在吸附-解吸过程中均属支配因素。[ Objective ] The adsorption-desorption characteristics of chlorimuron-ethyl in soils were investigated to provide the basic data on evaluating the safety in field and the risk to water resource. [Method] The adsorption-desorption experiment was conducted by the batch equilibration and HPLC techniques, furthermore, data were analyzed with 5 mathematic models to describe the characteristics and mechanism of adsorption-desorption and translocation of the herbicide in soils. [Result] The results showed that the adsorption-resorption isotherms of chlorimuron-ethyl fitted for Freundlich model well, and the physical reaction perform main contribution during adsorption-desorption process. The adsorption values （Kads-f） of chlorimuron-ethyl in 8 types of soil ranged from 0.798 to 6.891. The isotherms of 2^# （Jangxi Clay） and 3^# （Jiangxi sand loam） soils belong to S-type curve, while the isotherms of another 6 types of soil belong to L-type isotherm. The results of desorption indicated that the hystersis phenomena appeared during the desorption process, and the hystersis coefficients （H） of the herbicides in 8 soils varied from 0.259-0.980. Furthermore, Kads-f and desorption values （Kf-des） increased with the increase of the percentage of OM and the increase of clay content, while decreased with the increase of soil pH. H values decreased with the increase of the percentage of OM and the increase of clay content and increased with the increase of soil pH. [ Conclusion] It is concluded that the low adsorption abilities of chlorimuron-ethyl in test soils and un-reversible adsorption existed in the process, which would induce the great translocation of the herbicide after applied in field. It could be transported to ground or ground water causing risk to environments. Physical and chemical properties of soils, including OM percentage, clay content and pH of soil, performed dominating factors during the adsorption-desorption.

关 键 词：氯嘧磺隆 吸附-解吸 FREUNDLICH模型 滞后现象 土壤理化性质 

分 类 号：X53[环境科学与工程—环境工程]