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超声辅助乳化分散液-液微萃取与分光光度法联用新体系测定痕量银的研究毕业论文

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'大理学院药学与化学学院本科生毕业论文题目:超声辅助乳化分散液-液微萃取与分光光度法联用新体系测定痕量银的研究 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诺:所呈交的毕业设计(论文),是我个人在指导教师的指导下进行的研究工作及取得的成果。尽我所知,除文中特别加以标注和致谢的地方外,不包含其他人或组织已经发表或公布过的研究成果,也不包含我为获得及其它教育机构的学位或学历而使用过的材料。对本研究提供过帮助和做出过贡献的个人或集体,均已在文中作了明确的说明并表示了谢意。作者签名:     日 期:     指导教师签名:     日  期:     使用授权说明本人完全了解大学关于收集、保存、使用毕业设计(论文)的规定,即:按照学校要求提交毕业设计(论文)的印刷本和电子版本;学校有权保存毕业设计(论文)的印刷本和电子版,并提供目录检索与阅览服务;学校可以采用影印、缩印、数字化或其它复制手段保存论文;在不以赢利为目的前提下,学校可以公布论文的部分或全部内容。作者签名:     日 期:      学位论文原创性声明本人郑重声明:所呈交的论文是本人在导师的指导下独立进行研究所取得的研究成果。除了文中特别加以标注引用的内容外,本论文不包含任何其他个人或集体已经发表或撰写的成果作品。对本文的研究做出重要贡献的个人和集体,均已在文中以明确方式标明。本人完全意识到本声明的法律后果由本人承担。作者签名:日期:年月日学位论文版权使用授权书本学位论文作者完全了解学校有关保留、使用学位论文的规定,同意学校保留并向国家有关部门或机构送交论文的复印件和电子版,允许论文被查阅和借阅。本人授权    大学可以将本学位论文的全部或部分内容编入有关数据库进行检索,可以采用影印、缩印或扫描等复制手段保存和汇编本学位论文。涉密论文按学校规定处理。作者签名:日期:年月日导师签名:日期:年月日 目录摘要.....................................................................................................................................1Abstract................................................................................................................................11前言..................................................................................................................................22实验部分..........................................................................................................................32.1主要仪器和试剂........................................................................................................32.2试验方法....................................................................................................................43结果讨论..........................................................................................................................53.1UAE-DLLME实验条件优化....................................................................................53.1.1吸收曲线.........................................................................................................53.1.2超声时间的优化.............................................................................................63.1.3显色剂(溶剂三氯甲烷)浓度的优化.........................................................73.1.4萃取剂的选择.................................................................................................83.1.5萃取剂用量的优化.........................................................................................83.1.6复溶剂的选择.................................................................................................93.1.7pH的优化........................................................................................................93.1.8共存离子的影响...........................................................................................103.1.9超声与加入分散剂的比较...........................................................................113.2直接显色测定(不萃取)实验条件优化..............................................................123.2.1显色剂(溶剂四氢呋喃)浓度的优化.......................................................123.2.2pH的优化......................................................................................................133.3方法的性能指标......................................................................................................133.4样品分析..................................................................................................................144结论................................................................................................................................15参考文献............................................................................................................................15致谢....................................................................................................................................18大理学院药学与化学学院毕业论文第2页共18页 大理学院药学与化学学院毕业论文[摘要]:本文创新性地将先进的超声辅助乳化分散液-液微萃取(UAE-DLLME)技术与紫外可见分光光度法联用,建立了分析和测定痕量银的新方法。传统分散液-液微萃取中的分散剂被本方法中的超声乳化作用所取代,体现出更好的乳化和萃取效果,使分析方法更为绿色。在超声辅助乳化的3分钟时间内萃取高效率地完成。与传统的DLLME比较,UAE-DLLME更加简单、绿色和高效,萃取和预富集的效果得到显著提高。将此新型先进的萃取技术与普通的分光光度法联用,极大提高了分光光度法的分析性能,扩展了分光光度法测定的应用范围。详细优化了影响萃取效率和测定结果的实验条件,如络合剂的浓度、超声时间、萃取剂的选择和用量、溶液酸度条件、相分离条件及仪器条件等。在最佳实验条件下考察了所建立方法的分析性能,检出限(LOD)为0.45μg/L,富集倍数达35倍。将所建立方法应用于测定水样中痕量银,得到理想的分析结果。[关键词]:超声辅助乳化分散液-液微萃取;分光光度法测定;联用;预富集;银[Abstract]:Inthiswork,anewcouplingofspectrophotometricdeterminationwithadvancedpreconcentrationmethodnamedasultrasound-assistedemulsificationdispersiveliquid-liquidmicroextraction(UAE-DLLME)fortracesilverwasfirstlyestablished.DispersersolventintraditionalDLLMEwassubstitutedbyultrasound-assistedemulsification,whichcouldaffordmoreeffectiveemulsificationandmaketheextractionmethodgreener.Theextractionwasaccomplishedefficientlyinonly3minduringultrasound-assistedemulsification.ComparedtotraditionalDLLME,theestablishedUAE-DLLMEpretreatmentwassimpler,greenerandmoreeffective.Theefficiencyofextractionandpreconcentrationwasgreatlyimproved.Theadvancedextractiontechniquewaseffectivelycoupledwithordinaryspectrophotometertoimprovetheanalyticalperformanceandexpandtheapplicationofspectrophotometricdetermination.ThefactorsinfluencingUAE-DLLME,suchasconcentrationofchelatingagent,kindandvolumeofextractant,pH,conditionsofphaseseparation,ultrasoundextractiontimeandinstrumentalconditions,werestudiedindetail.Undertheoptimalconditions,thelimitofdetection(LOD)forsilverwas0.45µg/L,withsensitivityenhancementfactor(EF)of35.Theestablishedmethodwasappliedtothedeterminationoftracesilverinwatersampleswithsatisfactoryanalyticalresults.[Keywords]:ultrasound-assistedemulsificationdispersiveliquid-liquidmicroextraction;Spectrophotometricdetermination;Coupling;Preconcentration;Silver第21页共18页 大理学院药学与化学学院毕业论文超声辅助乳化分散液-液微萃取与分光光度法联用新体系测定痕量银的研究学生:孔腊梅指导老师:温晓东博士/副教授1前言银是一种重金属环境污染物,广泛存在于水体、土壤、生物体中,属蓄积性的毒物。随着工业的发展,银的污染也日益严重,其中以金属加工厂所排放废水含银量最高。直接排放对环境及水生生物的毒性非常大。而且长期接触的人会出现全身性银质沉着症。全身皮肤广泛的色素沉着,呈灰蓝黑色或浅石板色;眼部银质沉着造成眼损害;呼吸道银质沉着造成慢性支气管炎等。因此,对环境水样及食物样品中的银含量进行分析测定具有实际意义及应用价值。目前国内外研究测定各种物质中银含量的方法很多,主要有:3,5-Br2-PADAP法[1]、原子吸收分光光度法[2]、直接吸入火焰原子吸收法[3]、双硫腙-甲基异丁酮(MIBK)萃取火焰原子吸收法[4]、镉试剂2B分光光度法[5]、石墨炉原子吸收法[6]等,这些方法消耗的试剂量和耗能量都比较大而且灵敏度不高。但实际样品中银的含量往往比较低,基体相对复杂,某些仪器的灵敏度及抗干扰能力不足以进行直接分析,因此准确测定其含量就显得极为重要,而这需要采用适当的分离富集技术对样品进行前处理,使其浓度达到可监测水平[7]。传统的液相萃取技术(liquid-liquidextraction,LLE)是常用的一类样品前处理方法,但普遍存在操作繁琐费时,富集倍数低,且需耗费大量高纯、有毒有机试剂等缺点,长期使用对操作人员的身体伤害很大,而且对环境造成严重污染。因此研究高效、快速的无溶剂或少溶剂的微型化、绿色样品前处理技术已成为现代分析化学研究的前沿课题之一[8]。液相微萃取技术(liquidphasemicroextraction,LPME)是由Jeannot和Cantwell在1996年提出的一种新型样品前处理技术,它克服了传统液-液萃取技术的诸多不足,具有消耗试剂少、简单、廉价等优点[9]。目前液相微萃取的形式主要有三种,液滴悬挂液相微萃取[10]、中空纤维介入液相微萃取[11]、分散液相微萃取[12]。分散液相微萃取(dispersiveliquid-liquidmicroextraction,SLLME)是由Rezaee[12]于2006年首次提出的一种新型样品前处理技术,借助微量的分散剂促进萃取剂和样品溶液两相的混合与传质,而形成了第21页共18页 大理学院药学与化学学院毕业论文乳浊液体系,然后离心分层。该方法具有操作简单、成本低廉、环境友好等优点。超声萃取技术是近年来新发展起来的一种新型分离技术。具有无污染、效率高、速度快等优点[13,14]。近年来,超声萃取也开始应用于色谱前处理技术中[15,16,17,18,19]。将超声技术用于液相微萃取的研究已有报道[20,21]。它是在分散液-液微萃取(DLLME)基础上辅以超声技术,利用超声波在超声过程中产生的空化效应、热效应、机械搅拌、强化扩散、乳化作用等一系列效应,来加快萃取过程中的传质作用,从而提高萃取效率[22]。通过实用超声技术,取代了DLLME中分散剂的使用,在提高萃取效率的同时减少了有机溶剂的使用。目前分散液液微萃取(DLLME)与分光光度法联用的工作不多,而研究超声辅助与分散液-液微萃取相结合国内文献很少报道,国外近期相关文献也不多,且相对集中在与比较高端的分析仪器联用,如ET-AAS,GC-MS,HPLC-MS,HPLC,GC,FAAS,但是未见与分光光度法联用。分光光度法仪器非常简单,成本极低,因此应用非常广泛,这是其最大优点。然而其灵敏度相对上述仪器则差很多,从而严重制约了这个仪器的应用。如果将先进的分离富集前处理技术与此仪器联用,则可以提高方法的分析性能,从而极大拓展这种仪器的应用范围。因此,在本工作中将新型的超声辅助乳化分散液-液微萃取技术(UAE-DLLME)与分光光度法相结合,实现了对痕量的银的准确测定。实验中对影响萃取效率的各实验条件如显色剂浓度、萃取剂选择以及体积、超声时间、pH值、复溶剂选择以及体积等因素进行了优化,在最优实验条件下获得了良好的分析性能,并对实际样品进行了分析测定。相对DLLEM,UAE-DLLME的分析性能、萃取效率显著提高,通过与普通分光光度法结合,极大提高了该仪器的分析性能。以下是详细的实验内容。2试验部分2.1主要仪器和试剂仪器:TU-1901双光束紫外可见分光光度计(北京普析通用仪器有限责任公司);pHS-25型酸度计(上海虹益仪器仪表有限公司);TDL-5-A型离心机(上海安亭科学仪器厂);SB25-12D超声波清洗机(宁波新芝生物科技股份有限公司);电子天平(上海梅特勒-托利多仪器有限公司)试剂:银标准储备溶液(100µg/mL):准确地称取分析纯AgNO3(第21页共18页 大理学院药学与化学学院毕业论文上海旭达精细化工厂)0.0157g于烧杯中,加少量5%的HNO3(成都市欣海兴化工试剂厂)溶解后,定容至100mL容量瓶中。银标准工作溶液(10µg/mL):取10mL标准储备溶液于烧杯中,用二次蒸馏水稀释定容至100mL容量瓶中。分别用三氯甲烷和四氢呋喃配制成双硫腙(天津市大茂化学试剂厂)(1.0×10-3mol/L)。其他试剂:三氯甲烷(天津化学试剂有限公司);四氢呋喃(天津市化学试剂研究所);无水乙醇(天津市协和昊鹏色谱科技有限公司);甲醇(成都市科龙化工试剂厂);丙酮(重庆茂业化学试剂有限公司);乙腈(天津市协和昊鹏色谱科技有限公司);二氯甲烷(上海强顺化学试剂有限公司);四氯化碳(郑州化学试剂二厂);硝酸(成都市欣海兴化工试剂厂);盐酸(重庆川东化工集团);乙酸乙酯(天津市致远化学试剂有限公司);正辛醇(上海远航化工厂);冰乙酸(天津市协和昊鹏色谱科技有限公司)等均为分析纯。所用容器使用前均用5%硝酸浸泡处理,实验用水为二次蒸馏水。2.2实验方法准确移取0.4mLAg标准工作液(10µg/mL)置于40.0mL具塞离心管中,然后加入3.6×10-6mol/L双硫腙(螯合剂溶剂为三氯甲烷),调节pH于9.0处并充分摇荡后用注射器快速注入1.2mLCCl4(萃取剂),用二次蒸馏水定容至40.0mL。摇匀并超声振荡3min,CCl4以微滴形式均匀分散在溶液中,形成一个乳浊液体系。在这一过程中Ag和双硫腙发生络合反应生成Ag-双硫腙络合物,并且迅速地被萃取到四氯化碳微滴中。然后,充分摇匀后,以4000r/min的转速离心3min,分散在水相中的CCl4微滴沉积到试管底部,待水相和有机相完全分离后,用注射器除去水相,用乙酸乙酯复溶至3.0mL,用1cm比色皿,于波长415nm处,以试剂空白为参比进行测定。第21页共18页 大理学院药学与化学学院毕业论文图1UAE-DLLME操作及原理示意图3结果讨论3.1UAE-DLLME实验条件优化3.1.1吸收曲线研究UAE-DLLME富集后分光光度法测定的吸收曲线:准确移取0.4mL10µg/mL银标准工作液,置于40.0mL具塞离心试管中,然后加入3.6×10-6mol/L双硫腙(螯合剂溶剂为三氯甲烷),调节pH于9.0处并充分摇荡后,用注射器快速注入1.2mLCCl4(萃取剂),充分振荡1min,用蒸馏水定容至40.0mL。充分摇荡超声3min后,以4000r/min的转速离心3min,分散在水相中的CCl4微滴沉积到试管底部,水相和有机相完全分离,用注射器除去水相。有机相用丙酮复溶至3.0mL,用1cm比色皿,以试剂空白为参比,在350-600nm之间,测得吸收光谱,它的最大吸收峰位于415nm(见图2实线Ⅰ)并在λ=415nm开展超声辅助乳化-分散液液微萃取的实验工作。研究直接显色(不萃取)的吸收曲线:在10.0mL具塞离心管中加入2.0mL10第21页共18页 大理学院药学与化学学院毕业论文µg/mL银标准工作液和7×10-5mol/L双硫腙(螯合剂溶剂为四氢呋喃),混合均匀显色后,用1cm比色皿,以试剂空白为参比,在400-700nm之间,测得的吸收光谱,它的最大吸收峰位于460nm(图2虚线Ⅱ)。研究发现,UAE-DLLME富集后的最大吸收波长发生蓝移。可能由于萃取过程中有机试剂的引入导致络合物的光谱性质发生了一些变化。通过此实验确定了UAE-DLLME与分光光度法联用分析体系的工作波长以及研究直接显色分光光度法测定的工作波长。图2(实线Ⅰ):最佳吸收波长的优化(CAg+=0.1µg/mL,C双硫腙=3.6×10-6mol/L(溶剂三氯甲烷),1.2mLCCl4(萃取剂),超声3min后以4000r/min的转速离心3min,pH=9.0,有机相用丙酮复溶至3.00mL)图2(虚线Ⅱ):(CAg+=2µg/mL,C双硫腙=7×10-5mol/L(溶剂四氢呋喃),pH=6.5)3.1.2超声时间的优化超声是利用超声波在超声过程中产生的空化效应、热效应、机械搅拌、强化扩散、乳化作用等一系列效应,来加快萃取过程中的传质作用,从而提高萃取效率。通过实用超声技术,取代了DLLME中分散剂的使用,在提高萃取效率的同时减少了有机溶剂的使用。在本实验中超声时间分别考查了1、2、3、5、8、10、12、15min。结果表明,超声3min效果最佳(如图3)。并以此为条件展开下面的工作第21页共18页 大理学院药学与化学学院毕业论文图3:(CAg+=0.25µg/mL,C双硫腙=5×10-6mol/L(溶剂三氯甲烷),1.0mLCCl4(萃取剂),超声后以4000r/min的转速离心3min,有机相用丙酮复溶至3.00mL,pH=9.0,λ=415nm)3.1.3显色剂(溶剂三氯甲烷)浓度的优化双硫腙螯合物是许多重金属的分光光度法的基础,已成功应用于铅、镉、铜、锌多种痕量金属离子的分离富集,故本实验选用双硫腙作为螯合剂。本实验对双硫腙浓度在0.5×10-6-1×10-5mol/L范围内对其进行优化,其结果如图4所示,随着双硫腙浓度的增大,吸光度逐渐增大,当加入的双硫腙浓度超过3.6×10-6mol/L时吸光度逐渐减小,最后趋于不变,由于双硫腙和Ag-双硫腙络合物同时被萃取到富集相中,导致目标分析物的相对含量减少,致使吸光度下降。因此双硫腙浓度在3.6×10-6mol/L为最佳,并以此条件开展下面的实验工作。图4:(CAg+=0.1µg/mL,双硫腙(溶剂三氯甲烷),0.5mLCCl4(萃取剂),超声3min后以4000r/min的转速离心3min,有机相用丙酮复溶至3.00mL,pH=9.0,λ=415第21页共18页 大理学院药学与化学学院毕业论文nm)3.1.4萃取剂的选择选择合适的萃取剂是提高分析灵敏度的关键。根据“相似相溶原理”,萃取剂的性质必须与分析物性质相匹配,才能保证对分析物有较强的萃取富集能力。在分散液-液微萃取中萃取剂必需满足两个条件:一是其密度必须大于水,这样才能通过离心的方法把水溶液与萃取剂分离;二是萃取剂不溶于水但对待测物的溶解能力要大,以保证取得良好的萃取效率。卤代烃的密度都比较大,所以一般都选用卤代烃作为萃取剂,如二氯甲烷、三氯甲烷、四氯化碳、卤苯、四氢呋喃等。在本实验中,对二氯甲烷、三氯甲烷、四氯化碳、正辛醇四种萃取剂的萃取分析性能进行了考察,实验表明,四氯化碳的萃取效果最佳(见图5),经优化选择四氯化碳作为萃取剂开展下面的实验工作。图5:(CAg+=0.1µg/mL,C双硫腙=3.6×10-6mol/L(溶剂三氯甲烷),1mL(萃取剂),超声3min后以4000r/min的转速离心3min,最后有机相用丙酮复溶至3.00mL,pH=9.0,λ=415nm)3.1.5萃取剂的用量优化萃取过程中所加萃取剂的体积直接影响该方法的富集倍数。在本试验中,分别考察了萃取剂体积为0.1、0.2、0.3、0.4、0.5、0.8、1.0、1.1、1.2、1.3、1.4、1.5、2.0、2.5、3.0mL的CCl4,实验表明,选用1.2mL的CCl4萃取效果最佳(见图6第21页共18页 大理学院药学与化学学院毕业论文),并以此条件开展下面的实验工作。图6:(CAg+=0.1µg/mL,C双硫腙=3.6×10-6mol/L(溶剂三氯甲烷),CCl4(萃取剂),超声3min后以4000r/min的转速离心3min,有机相用丙酮复溶至3.00mL,pH=9.0,λ=415nm)3.1.6复溶剂的选择在本实验中,对复溶剂甲醇、乙醇、丙酮、乙腈、乙酸乙酯进行考察。实验表明,选用乙酸乙酯作为复溶剂效果最佳(见图7),说明复溶剂乙酸乙酯对本实验起到明显的增敏作用,是本实验较关键的一个影响因素。经优化选择乙酸乙酯作为复溶剂开展下面的实验工作。图7:(CAg+=0.1µg/mL,C双硫腙=3.6×10-6mol/L(溶剂三氯甲烷),1.2mLCCl4(萃取剂),超声3min后以4000r/min的转速离心3min,有机相复溶至3.00mL,pH=9.0,λ=415nm)第21页共18页 大理学院药学与化学学院毕业论文3.1.7pH的优化超声辅助乳化分散液-液微萃取方法萃取金属离子时,需要采用合适的络合剂与金属离子形成稳定的、疏水性的络合物,然后被萃取到萃取剂中。萃取介质的pH值会影响络合物的形成,从而对分散液-液微萃取的萃取效率产生影响。调整样品溶液的pH值,可以提高酸性或碱性分析物的萃取效率。而外界对本实验的酸碱度影响不大,可以用适当的酸碱或缓冲溶液来调节pH值,但实际样品中的酸碱度一般比较大,用酸碱调节不易控制其pH。因此本实验选用不同pH的缓冲溶液调节溶液的pH值,pH在2.0-11.0范围内变化的吸光度,结果如图8所示,随着pH的增大吸光度逐渐增大,当pH=9.0时吸光度最大,当pH大于9.0是吸光度急剧下降。说明溶液的pH对于本实验是一个很关键的影响因素。下面的实验工作中,pH在9.0的条件下开展。图8:(CAg+=0.1µg/mL,C双硫腙=3.6×10-6mol/L(溶剂三氯甲烷),1.2mLCCl4(萃取剂),超声3min后以4000r/min的转速离心3min,有机相用乙酸乙酯复溶至3.00mL,λ=415nm)3.1.8共存离子的影响共存离子的影响主要取决于两个方面:一是其他金属离子与双硫腙形成络合物的稳定性,这是属于共存金属元素对络合剂的竞争性络合,从而影响了银与双硫腙的络合效果;二是形成的各金属络合物在萃取剂中的萃取效率,它们可能会与Ag-双硫腙络合物共同萃取到有机相中,在影响目标元素萃取效率的同时,由于其他络合物的不同颜色也干扰光度法测定结果。在实验中将各种干扰离子加入到50ng/mL的Ag标准溶液中,按照实验方法进行操作,在优化的实验条件下,对一些常见的共存离子进行考察,所得各离子的最大允许量(回收率大于90%)列于表1。第21页共18页 大理学院药学与化学学院毕业论文实验表明,所建立方法对于水体中常见元素有很强的抗干扰能力,基体中共存元素几乎不会对分析测定产生干扰。而对重金属元素的抗干扰能力就相对减弱。对于少数干扰严重的重金属元素,需要采取络合或去除的方法以消除其干扰。表1共存离子对测定银的干扰Table1Tolerantlimitsofcoexistingionsforthedeterminationofsilver(50ng/mL)加入离子共存离子浓度/银标液浓度回收率(%)K+16,00099.0Na+13,00094.0Ca2+8,00097.0Mg2+7,00096.3Cl-8,00095.0NO3-16,00099.0SO42-3,50094.3Ba2+1,50098.7Fe3+50095.3Al3+500100.3Co2+25099.7Pb2+40093.8Cd2+1090.7Zn2+10100(usingEDTA)101.3105.9Mn2+500107Cu2+20092.7Ni2+30093.0Bi(Ⅴ)20093.0Hg2+591.73.1.9超声与加入分散剂的比较超声是通过使用超声技术,取代了DLLME中分散剂的使用,在提高萃取效率的同时减少了有机溶剂的使用。本实验分别采用了UAE-DLLME和传统的DLLME进行比较,实验表明(如图9),超声的效果最好,经优化在超声3min的实验条件下展开工作。第21页共18页 大理学院药学与化学学院毕业论文可见本工作中应用的UAE-DLLME是对传统DLLME的极大提高,将UAE-DLLME技术与分光光度法联用可以获得更好的分析性能。图9(UAE-DLLME的实验条件):(CAg+=0.1µg/mL,C双硫腙=3.6×10-6mol/L(溶剂三氯甲烷),1.2mLCCl4(萃取剂),超声3min后以4000r/min的转速离心3min,有机相用乙酸乙酯复溶至3.00mL,pH=9.0,λ=415nm)图9(DLLME的实验条件):(CAg+=0.1µg/mL,C双硫腙=3.6×10-6mol/L(溶剂三氯甲烷),1.2mLCCl4(萃取剂),加入分散剂甲醇/乙醇0.5mL后摇匀30s,以4000r/min的转速离心3min,有机相用乙酸乙酯复溶至3.00mL,pH=9.0,λ=415nm)3.2直接显色测定(不萃取)实验条件优化3.2.1显色剂(溶剂四氢呋喃)的浓度优化本实验在1×10-5-1.2×10-4mol/L浓度范围内对其进行了优化,双硫腙浓度在7×10-5mol/L为最佳(如图10),并以此为条件展开下面的实验工作。第21页共18页 大理学院药学与化学学院毕业论文图10:(CAg+=2µg/mL,C双硫腙(溶剂四氢呋喃),λ=460nm,pH=6.5)3.2.2pH的优化pH介质会影响络合物的形成,调整pH值能够改变一些酸性或碱性分析物的在溶液中的电离平衡,使其更多地向中性分子方向转变。试验中考查了溶液pH值在2.0-10.0范围内变化时的吸光度,结果如图11所示。pH=6.5时吸光度值发生了突越。下面的实验工作中pH=6.5的条件下展开。图11:(CAg+=2µg/mL,C双硫腙=7×10-5mol/L(溶剂四氢呋喃),λ=460nm)3.3方法的性能指标在优化条件下,用一系列浓度为20、40、60、80、100、150、200ng/mL的Ag标准工作液,按照本实验方法,测定吸光度并绘制标准工作曲线(见图12)。在水相直接显色不萃取的情况下,再用一系列浓度为500、1000、1500、2000、4000、5000、6000ng/mL的Ag标准工作液,在优化条件下,测定吸光度并绘制标准工作曲线(见图13)。方法性能指标对比见表2。第21页共18页 大理学院药学与化学学院毕业论文图12:萃取的工作曲线图13:不萃取的工作曲线UAE-DLLME-Uv-vis与直接显色分光光度法测定的分析性能对比如表2:表2方法分析性能Table2Analyticalfiguresofmerit线性方程超声萃取后A=0.0035C+0.109未萃取直接显色A=0.0001C+0.0018线性范围上限超声萃取后200ng/mL未萃取直接显色6000ng/mL检出限(LOD)超声萃取后0.45ng/mL未萃取直接显色18ng/mL线性相关系数R2超声萃取后0.9982未萃取直接显色0.9994RSD超声萃取后3.2%(50ng/mL)灵敏度富集倍数353.4样品分析将该方法应用于洱海水、西洱河水(美登大桥段)、自来水样品中Ag的含量测定,取20.0mL水样在优化条件下按照实验方法进行测定,并进行了加标回收实验(见表第21页共18页 大理学院药学与化学学院毕业论文3)。从分析测定结果表明,加标回收率在95.7-104.3%之间。表3水样中银的测定结果Table3Analyticalresultsfornickelinrealwatersamples水样测定值(µg/L)加标量(µg/L)回收率/%自来水未检出2095.7自来水未检出5097.1洱海水未检出20104.3洱海水未检出50102.9西洱河水未检出20102.9西洱河水未检出50101.14.结论本文建立了超声辅助乳化分散液-液微萃取与紫外可见分光光度法联用技术快速测定水样中痕量银的新方法,实验结果表明该方法具有灵敏度高,富集倍数较大,操作简单,成本低,环境友好等特点。本方法是对传统DLLME技术的提升和拓展,同时致力于提高普通分光光度法的分析性能,具有实用价值和研究意义。UAE-DLLME的研究工作表明,超声乳化取代DLLME中传统分散剂具有很好的效果,分析性能得到提高。通过将此先进的富集技术与普通光度法结合,极大提高了测定银的分析性能,实现了银的痕量分析。参考文献[1]环境保护部.HJ489-2009水质银的测定3,5-Br2-PADAP分光光度法[M].中国环境科学出版社,2009:1-3.[2]经幼苹.原子吸收分光光度法测定矿石中的银[J].化工冶金,1983,(04):53-55.[3]王君苑,红洁,刘玉勇.络合萃取-火焰原子吸收法测定银[J].黑龙江水利科技,2007,(02):162.[4]张贤忠,夏传俊.双硫腙-甲基异丁酮(MIBK)萃取火焰原子吸收法测定水中银[J].安徽师范大学学报(自然科学版),1997,(02):80-82.[5]环境保护部.HJ490-2009水质银的测定隔试剂2B分光光度法[M].中国环境第21页共18页 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大理学院药学与化学学院毕业论文致谢本论文是在导师温晓东老师的悉心指导和严格要求下完成的。首先我要向在论文写作中给予我悉心关怀、鼓励和指导的温老师致以深深的敬意和谢意。他一丝不苟的钻研精神,严谨求实的治学态度,执着忘我的工作作风,独树一帜的思维方式,以及我在撰写论文期间,对我的宽容和理解使我难以忘怀,而温老师严谨的治学态度和广泛的涉猎将成为我人生的积淀,使我受益匪浅。温老师严谨的治学态度、丰富渊博的知识、敏锐的学术思维、精益求精的工作态度、积极进取的科研精神以及诲人不倦的师者风范是我毕生的学习楷模。在本论文的完成过程中,自始至终得到了邓庆文老师、郭洁老师、赵霞老师、杨明惠老师、杨永寿老师、袁朗白老师、王基伟老师、杨志洁老师、杨盛春老师、李龙星老师等热心的帮助,在此致以最诚挚的谢意。同时感谢所有教授过我课程的大理学院的老师们,是他们孜孜不倦的教诲成就了现在的我。感谢陈美卉同学感谢你陪我闯过三个多月以来那些风风雨雨,感谢在最无助的时候有你鼓励,感谢在晚上十点多的时候至少还有你陪伴我在孤独的实验室。亲爱的朋友,想说真得很谢谢你陪我走过那么多里地!感谢四年中陪伴在我身边的同学、朋友们,感谢他们为我提出的有益的意见和建议,有了他们的支持、鼓励和帮助,我才充实的度过了大学四年的学习生活。感谢我的家人,正是他们在物质和精神上的支持为我能够顺利完成毕业论文提供了巨大的帮助。最后,我要向在百忙中抽出时间对本论文进行审阅、评议和参加本人论文答辩的各位老师表示感谢!第21页共18页 大理学院药学与化学学院毕业论文学位论文原创性声明本人郑重声明:所呈交的学位论文,是本人在导师的指导下进行的研究工作所取得的成果。尽我所知,除文中已经特别注明引用的内容和致谢的地方外,本论文不包含任何其他个人或集体已经发表或撰写过的研究成果。对本文的研究做出重要贡献的个人和集体,均已在文中以明确方式注明并表示感谢。本人完全意识到本声明的法律结果由本人承担。学位论文作者(本人签名):年月日学位论文出版授权书本人及导师完全同意《中国博士学位论文全文数据库出版章程》、《中国优秀硕士学位论文全文数据库出版章程》(以下简称“章程”),愿意将本人的学位论文提交“中国学术期刊(光盘版)电子杂志社”在《中国博士学位论文全文数据库》、《中国优秀硕士学位论文全文数据库》中全文发表和以电子、网络形式公开出版,并同意编入CNKI《中国知识资源总库》,在《中国博硕士学位论文评价数据库》中使用和在互联网上传播,同意按“章程”规定享受相关权益。论文密级:□公开□保密(___年__月至__年__月)(保密的学位论文在解密后应遵守此协议)作者签名:_______导师签名:______________年_____月_____日_______年_____月_____日第21页共18页 大理学院药学与化学学院毕业论文独创声明本人郑重声明:所呈交的毕业设计(论文),是本人在指导老师的指导下,独立进行研究工作所取得的成果,成果不存在知识产权争议。尽我所知,除文中已经注明引用的内容外,本设计(论文)不含任何其他个人或集体已经发表或撰写过的作品成果。对本文的研究做出重要贡献的个人和集体均已在文中以明确方式标明。本声明的法律后果由本人承担。 作者签名:二〇一〇年九月二十日 毕业设计(论文)使用授权声明本人完全了解滨州学院关于收集、保存、使用毕业设计(论文)的规定。本人愿意按照学校要求提交学位论文的印刷本和电子版,同意学校保存学位论文的印刷本和电子版,或采用影印、数字化或其它复制手段保存设计(论文);同意学校在不以营利为目的的前提下,建立目录检索与阅览服务系统,公布设计(论文)的部分或全部内容,允许他人依法合理使用。(保密论文在解密后遵守此规定) 作者签名:二〇一〇年九月二十日第21页共18页 大理学院药学与化学学院毕业论文致谢时间飞逝,大学的学习生活很快就要过去,在这四年的学习生活中,收获了很多,而这些成绩的取得是和一直关心帮助我的人分不开的。首先非常感谢学校开设这个课题,为本人日后从事计算机方面的工作提供了经验,奠定了基础。本次毕业设计大概持续了半年,现在终于到结尾了。本次毕业设计是对我大学四年学习下来最好的检验。经过这次毕业设计,我的能力有了很大的提高,比如操作能力、分析问题的能力、合作精神、严谨的工作作风等方方面面都有很大的进步。这期间凝聚了很多人的心血,在此我表示由衷的感谢。没有他们的帮助,我将无法顺利完成这次设计。首先,我要特别感谢我的知道郭谦功老师对我的悉心指导,在我的论文书写及设计过程中给了我大量的帮助和指导,为我理清了设计思路和操作方法,并对我所做的课题提出了有效的改进方案。郭谦功老师渊博的知识、严谨的作风和诲人不倦的态度给我留下了深刻的印象。从他身上,我学到了许多能受益终生的东西。再次对周巍老师表示衷心的感谢。其次,我要感谢大学四年中所有的任课老师和辅导员在学习期间对我的严格要求,感谢他们对我学习上和生活上的帮助,使我了解了许多专业知识和为人的道理,能够在今后的生活道路上有继续奋斗的力量。另外,我还要感谢大学四年和我一起走过的同学朋友对我的关心与支持,与他们一起学习、生活,让我在大学期间生活的很充实,给我留下了很多难忘的回忆。最后,我要感谢我的父母对我的关系和理解,如果没有他们在我的学习生涯中的无私奉献和默默支持,我将无法顺利完成今天的学业。四年的大学生活就快走入尾声,我们的校园生活就要划上句号,心中是无尽的难舍与眷恋。从这里走出,对我的人生来说,将是踏上一个新的征程,要把所学的知识应用到实际工作中去。回首四年,取得了些许成绩,生活中有快乐也有艰辛。感谢老师四年来对我孜孜不倦的教诲,对我成长的关心和爱护。学友情深,情同兄妹。四年的风风雨雨,我们一同走过,充满着关爱,给我留下了值得珍藏的最美好的记忆。在我的十几年求学历程里,离不开父母的鼓励和支持,是他们辛勤的劳作,无私的付出,为我创造良好的学习条件,我才能顺利完成完成学业,感激他们一直以来对我的抚养与培育。最后,我要特别感谢我的导师赵达睿老师、和研究生助教熊伟丽老师。是他们在我毕业的最后关头给了我们巨大的帮助与鼓励,给了我很多解决问题的思路,在此表示衷心的感激。老师们认真负责的工作态度,严谨的治学精神和深厚的理论水平都使我收益匪浅。他无论在理论上还是在实践中,都给与我很大的帮助,使我得到不少的提高这对于我以后的工作和学习都有一种巨大的帮助,感谢他耐心的辅导。在论文的撰写过程中老师们给予我很大的帮助,帮助解决了不少的难点,使得论文能够及时完成,这里一并表示真诚的感谢。读书人是世间幸福人,因为他除了拥有现实的世界之外,还拥有另一个更为浩瀚也更为丰富的世界。第21页共18页 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