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1、1烃基黄药捕收剂的生物降解性评价陈绍华，龚文琪，梅光军，陈晓东，鄢恒珍（武汉理工大学资源与环境工程学院，湖北武汉430070）摘要：借鉴表面活性剂等有机污染物的生物降解性评价体系，采用BOD5/CODCr法、静置烧瓶试验法和OECD-301B（ISO9439）标准对烃基黄药的生物降解性进行了评价，考察了分子结构对生物降解度的影响。研究表明：乙基、正丁基、正戊基、异丙基、异丁基黄药的BOD5/CODCr值均小于0.25，第28d生物降解度分别为39.54%、36.88%、34.09%、29.17%、26.79%，生
2、物降解指数分别为101.0200、99.0199、88.7175、79.1256、71.8975，上述几种黄药对微生物的抑制时间分别为12、13、15、17、18d。三种评价方法得出结论是一致的，即上述几种黄药基本上是难生物降解的，其生物降解性顺序为:乙基黄药>正丁基黄药>正戊基黄药>异丙基黄药>异丁基黄药。相对碳链长度来说，分支度对黄药的生物降解性的影响更为显著。最后初步探讨了烃基黄药的生物降解机理，结果表明CS2、ROCSSH和单硫代碳酸盐是黄药生物降解的主要产物，同时有少量油状液滴双黄药生成。关键词：烃基黄
3、药；生物降解性；分子结构；机理中图分类号：X703文献标识码：A文章编号：EvaluationofbiodegradabilityofalkylxanthatesflotationcollectersCHENShao-hua，GONGWen-qi，MEIGuang-jun，CHENXiao-dong，YANHeng-zhen（SchoolofResourcesandEnvironmentalEngineering,WuhanUniversityofTechnology,Wuhan430070,China）Abst
4、ract：ThebiodegradabilityofalkylxanthateshasbeenevaluatedbythemethodsofBOD5/CODCr,static–flaskstestandOECD-301B(ISO9439),accordingtothetestingstandardforbiodegradabilityofsurfactantsandotherorganiccompounds.Meanwhile，theinfluenceofmolecularstructureonbiodegrad
5、abilityhasbeenstudied.Theresultsindicatedthat:theBOD5/CODCrofethylxanthate,butylxanthate,amylxanthate,isopropylxanthateandisobutylxanthatewerealllessthan0.25,thebiodegradationextentcanreach39.54%,36.88%,34.09%,29.17%and26.79%,respectively.Theindexofbiodegrada
6、bilitycanreach101.0200,99.0199,88.7175,79.1256,and71.8975,respectivelyin28d,andtheyhadsomeinhibitedeffectonmicroorganisms,thesuppressedtimeattained12,13,15,17,18d,respectively.Coincidentconclusionshadbeenobtainedthroughthesethreemethods:xanthatesweredifficult
7、todegradebymicroorganisms,andtheorderofthemagnitudeofthebiodegradabilitywasasfollows:ethylxanthate>butylxanthate>amylxanthate>isopropylxanthate>isobutylxanthate.Comparingtoalkylchainlength,thebranchedchainshadamoresignificanteffectonthedegradabilityofxanthate
8、s.Finally,thebiodegradationmechanismofalkylxanthateswaspreliminarilyexplored.TheresultsshowedthatCS2，xanthicacidandthiocarbonatewerethemainproductsofbiodegradationofxanthates,inwhichasmal
