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1、第27卷第8期环境科学学报Vo.l27,No.82007年8月ActaScientiaeCircumstantiaeAug.,2007杨成建,曾清如,曹优明,等.2007.腐殖酸极性与有机农药吸附行为的关系[J].环境科学学报,27(8):1320-1325YangCJ,ZengQR,CAOYM,etal.2007.Relationbetweenpolarityofhumicacidandadsorptionoforganicpesticides[J].ActaScientiaeCircumstantiae,27(8):1320-1325腐殖酸极性与有机农药吸附行为的关系1
2、,21,*21杨成建,曾清如,曹优明,杨海君1.湖南农业大学环境科学系,长沙4101282.重庆文理学院化学与环境科学系,重庆402168收稿日期:2006-10-16修回日期:2007-03-31录用日期:2007-06-20摘要:用不同的方法对腐殖酸(HA)进行了结构改性处理,并用元素分析仪、红外光谱仪和电位滴定仪对改性前后的HA进行了表征;通过振荡平衡法,研究了HA改性前后对有机农药甲基对硫磷、西维因、克百威的吸附行为.结果表明,水解处理使得HA的碳水化合物结构减少,肟化处理使得HA的CN结构增加,氧化处理使HA的芳香环发生开环反应、)COOH基团增加,肟化和氧化处理
3、均使得HA极性增强;有机农药甲基对硫磷、西维因、克百威通过分配作用吸附于HA,分配系数Kd与HA有的机碳含量成正比,HA的极性越强,吸附量越小.关键词:腐殖酸;结构改性;有机农药;吸附文章编号:0253-2468(2007)08-1320-06中图分类号:X131.3文献标识码:ARelationbetweenpolarityofhumicacidandadsorptionoforganicpesticides1,21,*21YANGChengjian,ZENGQingru,CAOYouming,YANGHaijun1.DepartmentofEnvironmentalSc
4、ience,HunanAgriculturalUniversity,Changsha4101282.DepartmentofChemistryandEnvironmentalScience,ChongqingUniversityofArtsandSciences,Chongqing402168Received16October2006;receivedinrevisedform31March2007;accepted20June2007Abstract:Humicacid(HA)wasstructurallymodifiedusingacidhydrolysis,oxima
5、tionandoxidation.Theelementalanalysis,fouriertransforminfraredspectrometry(FTIR)andpotentiometrictitrationwereusedtoobtainstructuralandcompositionalinformationofthethreemodifiedHAs.Thensorptionoforganicpesticidesparathion-methy,lcarbarylorcarbofuranontheHAwasexaminedinbatchsorptionexperime
6、nts.AcidhydrolysisremovedcarbohydratesfromHA;oximationmadeHAproducemoreoxime(C=N)groups;andoxidationresultedinaringcleavagereactionintheHAwhichproducedmorecarbonyl(-COOH)groups.BothoximationandoxidationincreasedHApolarity.SincethesorptionoforganicpesticidesonmodifiedHAsappearedtotakeplacem
7、orebyapartition,thesorptioncoefficientsKdoforganicpesticideswereproportionaltotheorganiccarboncontentofHA.AnditwasobservedthattheKdoforganicpesticidesonHAdecreasedwithincreasingpolarityofHA.Keywords:Humicacid;structurallymodification;organicpesticide;sorption1
