烯酰吗啉在土壤中的吸附及机理  

Adsorption and interaction mechanism of dimethomorph in three different soils

作　　者：谢吉民[1] 初亚飞[1] 刘军[1] 张辉[1] 郭慧琴[2] 孙成[2] 

机构地区：[1]江苏大学化学化工学院,江苏镇江212013 [2]南京大学环境学院,江苏南京210093

出　　处：《江苏大学学报（自然科学版）》2010年第1期88-92,共5页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(20677025);江苏省社会发展项目(BS2006052);江苏省工业高技术研究项目(BG2007025)

摘　　要：对烯酰吗啉在红土、黑土、潮土3种土壤中的吸附行为及其机理进行研究,并探讨了吸附时间、浓度、pH值对吸附的影响.结果表明,烯酰吗啉在3种土壤中的吸附行为能较好地符合Freun-dlish吸附等温式,拟合度均在0.99以上;影响土壤吸附的主要因素是土壤pH值;吸附常数Kf与pH值显示出较好的相关性(r=0.95);土壤对烯酰吗啉吸附量随着土壤pH值增高而降低;腐殖酸对烯酰吗啉吸附起决定作用,烯酰吗啉与腐殖酸发生电荷转移,并能与腐殖酸羟基形成氢键.In order to reveal the adsorption behavior and mechanism of dimethomorph in soils, the adsorptions of dimethomorph in three different soils were eondueted by batch sorption method, and influences of environmental factors were evaluated including consistency of solution, time, and pH value. The results show that adsorption isotherms can fit Freundlish equation well. The factor affecting soil adsorption is mainly soil pH. Adsorption coefficients Kf and pH value have a good correlation（r = 0.95）. The results of IR analysis show the formation of hydrogen bonds and the results of ESR suggest the existence of electric donor-aeeeptor mechanism between dimethomorph and humie acid.

关 键 词：烯酰吗啉 土壤 腐殖酸 吸附 机理 

分 类 号：X678[环境科学与工程]