外源木炭对苄嘧磺隆在土壤中吸附-解吸的影响  

EFFECTS OF CHARCOAL AMENDMENT ON ADSORPTION-DESORPTION OF BENSULFURON METHYL IN SOILS

作　　者：张燕[1] 司友斌[1] 

机构地区：[1]安徽农业大学资源与环境学院,合肥230036

出　　处：《土壤学报》2009年第4期617-625,共9页Acta Pedologica Sinica

基　　金：国家863计划(2006AA06Z356);国家973计划(2007CB936604);安徽省科技攻关计划(07010302212);安徽省人才开发资金(2007Z014)资助

摘　　要：采用振荡平衡法研究了除草剂苄嘧磺隆在3个不同粒径木炭和2种不同类型土壤中的吸附-解吸特征,重点考察了外源木炭对苄嘧磺隆在土壤中吸附-解吸过程的影响。结果表明,苄嘧磺隆在土壤和木炭中的吸附-解吸符合Freundlich方程。木炭对苄嘧磺隆有很强的吸附能力,木炭粒径越小,吸附能力越强。添加木炭能显著提高土壤对苄嘧磺隆的吸附量,木炭添加量越多,苄嘧磺隆吸附量越大,相对的解吸量越少。苄嘧磺隆在土壤和木炭中的解吸过程呈明显的滞后效应,且滞后效应随着苄嘧磺隆初始浓度增大和土壤中木炭添加量增大而逐渐加强。该项研究表明,以木炭作为人工添加吸附剂可有效的减少苄嘧磺隆从土壤中的流失。Adsorption-desorption of bensulfuron methyl, a kind of herbicide, in two types of soils treated with charcoal different in particle size, separately, was studied, using the batch equilibration technique, with focus on effect of charcoal amendment on adsorption-desorption of bensulfuron methyl in soils. Results show that the adsorption-desorption isotherms of bensulfuron methyl in charcoal and soils fitted the Freundlich equation （r 〉 0.90）. Charcoal showed a great adsorption capacity for bensulfuron methyl, and the smaller the particle size of charcoal, the higher the adsorption of bensulfuron methyl. The amendment of charcoal improved adsorption of bensulfuron methyl in the soils. The adsorption of bensulfuron methyl in the soils increased with the rate of charcoal amended. Desorption of bensulfuron methyl from charcoals and the soils displayed significant hysteresis, which was shown by the higher adsorption slope （1/ndes） compared to the desorption slope （1/ndes）. The hysteresis was closely related with the initial concentration of bensulfuron methyl and the content of charcoal in the soils, and the hysteresis index （H） increased with the rate of charcoal amended. This research suggests that charcoal can be used as artificially added adsorbent to efficiently control the pesticide in the soil from leaching.

关 键 词：木炭 苄嘧磺隆 吸附 解吸 土壤 

分 类 号：X592[环境科学与工程—环境工程]