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1、1烴基黃藥捕收劑的生物降解性評(píng)價(jià)陳紹華，龔文琪，梅光軍，陳曉東，鄢恒珍（武漢理工大學(xué)資源與環(huán)境工程學(xué)院，湖北武漢430070）摘要：借鑒表面活性劑等有機(jī)污染物的生物降解性評(píng)價(jià)體系，采用BOD5/CODCr法、靜置燒瓶試驗(yàn)法和OECD-301B（ISO9439）標(biāo)準(zhǔn)對(duì)烴基黃藥的生物降解性進(jìn)行了評(píng)價(jià)，考察了分子結(jié)構(gòu)對(duì)生物降解度的影響。研究表明：乙基、正丁基、正戊基、異丙基、異丁基黃藥的BOD5/CODCr值均小于0.25，第28d生物降解度分別為39.54%、36.88%、34.09%、29.17%、26.79%，生
2、物降解指數(shù)分別為101.0200、99.0199、88.7175、79.1256、71.8975，上述幾種黃藥對(duì)微生物的抑制時(shí)間分別為12、13、15、17、18d。三種評(píng)價(jià)方法得出結(jié)論是一致的，即上述幾種黃藥基本上是難生物降解的，其生物降解性順序?yàn)?乙基黃藥>正丁基黃藥>正戊基黃藥>異丙基黃藥>異丁基黃藥。相對(duì)碳鏈長(zhǎng)度來(lái)說(shuō)，分支度對(duì)黃藥的生物降解性的影響更為顯著。最后初步探討了烴基黃藥的生物降解機(jī)理，結(jié)果表明CS2、ROCSSH和單硫代碳酸鹽是黃藥生物降解的主要產(chǎn)物，同時(shí)有少量油狀液滴雙黃藥生成。關(guān)鍵詞：烴基黃
3、藥；生物降解性；分子結(jié)構(gòu)；機(jī)理中圖分類號(hào)：X703文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：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
