流动注射分光光度法检测皮革和制革废水中的甲醛毕业论文

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1、流动注射分光光度法检测皮革和制革废水中的甲醛摘要：游离甲醛不管在空气中还是在水体中对环境都有很大破坏。常规的检测方法都要使用昂贵且携带不便的分析仪器，分析成本较高并且不能实现在线检测。本文针对现有方法的不足，建立了一种灵敏度高、操作相对简单、可用于现场测定制革废水及皮革中甲醛的自动分析方法。工作原理为：乙酰丙酮在乙酸铵-乙酸缓冲溶液中与甲醛及氨发生反应，生成微黄色的2,6-二甲基-3,5-二乙酰基-1,4-二氢吡啶，该产物在414nm处有最大吸收，根据在该波长处的吸光度与甲醛浓度成比例关系对甲醛进行定量分

2、析。据此，建立了流动注射分光光度法测定皮革和制革废水中甲醛的方法。在最佳条件下，甲醛的浓度在0.025～3.000mg/L具有良好的线性关系，相关系数0.9996，检出限为0.025mg/L，回收率为96.41％～99.58％，用1.00mg/L标准溶液进样分析的相对标准偏差为0.95％(n=10)。利用此方法对实际皮革废水样品及绵羊皮革样品中甲醛进行测定，都取得了满意的结果。关键词：流动注射；分光光度法；皮革；甲醛；制革废水FlowInjectionSpectrophotometryDeterminat

3、ionofFormaldehydeinLeatherandLeatherWasteWaterMajor:LightChemicalEngineeringUndergraduateHeYutingSupervisorZhangXinshenAbstract:Freeformaldehydewhichisinairorwaterhasadestructiveeffectonenvironment.Usualdetectionmethodshaveseveraldefectssuchasusingcostlin

4、essandcumbersomeanalyticalapparatus,highcostandhavingadifficulttorealizeon-linedetection.Inthispaper,weapplyflowinfectionprincipletosetupahighlysensitiveandeasilyhandledwaytodetermineformaldehydeintheleatherandleatherwastewateratcrimescene.Themaincontento

5、fresearchaboveisdescribedasfollows:Acetylacetonehadareactionwithformaldehydeandammoniainthebuffersolutionofammoniumacetateandaceticacidtoformprimrose3,5-diacetyl-2,6-dimethyl-1,4-diludine.Theabsorbanceofthisproductwasmeasuredspectrophotometricallyat390nm.

6、Accordingtotheproportionalrelationshipbetweenabsorbencyinthiswavelengthandconcentrationofformaldehyde,formaldehydewasanalyzedquantitatively.Thenflowinjectionspectrophotometrydeterminationofformaldehydeinleatherandleatherwastewaterwassetup.Thelinearityconc

7、entrationrangeofthecalculationcurvewasfrom0.025-3.000mg/L,andcorrelationcoefficientwas0.9996,thedetectlimitwas0.025mg/L,percentrecoverywas96.41%~99.58%,andtherelativestandarddeviationwas0.95%(n=10)obtainedbyinjecting1.00mg/Lstandardformaldehydesolution.Th

8、eproposedmethodwassuccessfullyappliedtodetermineformaldehydeintanneryeffluentsandsheepleathersample.Keywords:Flowinjectionanalysis;Spectrophotometry;leather;formaldehyde;tanneryeffluent毕业设计（论文）原创性声明和使用授权说明原创性声明本人郑重承