苏州科技学院本科生毕业论文毕业论文：茶叶及其提取液中重金属Cu、Pb的检测摘要近年来，茶叶的质量和安全备受关注，而茶叶中的铅铜含量直接关乎饮用者的身体健康。本文使用火焰原子吸收光谱测定了铁观音、西湖龙井、碧螺春、黄山毛峰、祁门祁红、信阳毛尖、福建白茶、云南普洱等8种茶叶中的Cu和Pb的含量。分别采用酸加热消解和沸水浸泡溶出法处理茶叶样品，确定了两种方法的最佳实验条件，最后对这两种方法进行了比较。实验结果表明：所选择的8种茶叶中铅、铜的含量都没有超出国家限值，都可以放心使用，并比较得出酸法消解能更准确的测定茶叶中铅、铜的含量。关键词火焰原子吸收光谱；茶叶；酸法消解；沸水溶出DeterminationofPbandCuinteasanditsextractAbstractThequalityandsafetyofteasbecomesanimportantconcernofChineseinrecentyears.AndthecontentsofCuandPbhaveadirectlyeffectonpeople’health.TheconcentrationsofCuandPbbyFlameatomicabsorptionspectrometryfromeightChineseteas,thatis，Oolongtea,WestLakeLongjing,Springsnail,MountHuangshanMaoFeng,Qimenblacktea,XinyangMaojiantea,FujianwhiteteaandYunnanPu'er.aredeterminedinthisthesis.Teasamplesarepretreatedwithaciddigestionmethodandboiledwaterimmersionandextractionmethod.Theoptimalpretreatmentconditionsareselectedandtheresultsbetweenmentionedtwomethodsarecompared.OurexperimentsindicatesthattheconcentrationsofCuandPbfromselectedteasamplesareallbelowthemaximumvaluesofnationalteastandardsandthussafetytobeused.Moreover,resultsfromaciddigestionarebetterthanthosefromboiledwaterextraction.KeywordsFlameatomicabsorptionspectrometry,Tea,Aciddegistion,boiledwaterimmersion目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc326574144"1绪论PAGEREF_Toc326574144\h1HYPERLINK\l"_Toc326574145"1.1铅、铜的测定意义PAGEREF_Toc326574145\h1HYPERLINK\l"_Toc326574146"1.1.1铅、铜的简介PAGEREF_Toc326574146\h1HYPERLINK\l"_Toc326574147"1.1.2铅、铜对人体的影响PAGEREF_Toc326574147\h2HYPERLINK\l"_Toc326574148"1.2研究背景PAGEREF_Toc326574148\h4HYPERLINK\l"_Toc326574149"1.2.1相关标准PAGEREF_Toc326574149\h4HYPERLINK\l"_Toc326574150"1.2.2各种测定方法PAGEREF_Toc326574150\h4HYPERLINK\l"_Toc326574151"1.3研究目的PAGEREF_Toc326574151\h5HYPERLINK\l"_Toc326574152"2实验部分PAGEREF_Toc326574152\h6HYPERLINK\l"_Toc326574153"2.1仪器和试剂PAGEREF_Toc326574153\h6HYPERLINK\l"_Toc326574154"2.1.1仪器PAGEREF_Toc326574154\h6HYPERLINK\l"_Toc3265741