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1、本科生毕业论文本科毕业论文（20届）海产品中硒元素的测定----鱿鱼中硒元素的测定I本科生毕业论文摘要许多海产品中由于硒含量较高，是补硒的良好来源,因此其中硒含量的测定已成为微量元素领域中研究的重点。本文决定对舟山海域的水产品进行分析研究，通过查阅相关文献资料，初步了解了荧光分光光度法、原子吸收分光光度法、原子荧光光谱法等相关的检测方法，其中石墨炉原子吸收法是检测食品中的硒含量运用最广泛的方法，具有很高的灵敏度。但由于其最灵敏的共振线（196.1nm）位于紫外区，使背景吸收很强，基体干扰大。为了提高灵敏度和精密度，进行了许多改进，避免基体的干扰和
2、待测元素的挥发损失，其中加入基体改进剂是很好的办法。所以本次实验以镍为基体改进剂，在鱿鱼溶液样品中加入硝酸镍改善样液以提高硒的灰化温度，消除基体干扰。实验结果表明，硒的浓度和吸光度呈现良好的线性关系，标准曲线的相关系数达到0.9985左右，采用不同比例的两组混酸对多组鱿鱼样品进行预处理,并测定其硒元素含量为0.154μg/g，相对标准差小于10%,回收率在90%～110%之间，精密度和准确度均较好,测定方法简便、快捷。[关键词]：硒(Se)；鱿鱼；石墨炉原子吸收法；含量测定I本科生毕业论文Determinationofseleniuminseaf
3、ood，especiallyforsquidAbstractBecauseof thehigher contentofselenium,alotof seafood is agoodsourceofselenium,sothe selenium content ofwhich hasbecomethe focusofthestudy areaof traceelements.WedecidetodoanalysisinZhouShanseaareaofaquaticresearch.Byconsultingrelevantliterature,
4、apreliminaryunderstandingofspectrophotometry,atomicabsorptionspectrometry,atomicfluorescencespectrometryandrelateddetectionmethods,inwhichthegraphitefurnaceatomicabsorptionmethodistodetect theseleniumcontentoffoodthemostwidelyusedmethod,withhighsensitivity.However,dueto itsmo
5、st sensitive resonanceline (196.1nm) inthe ultravioletregion,the backgroundabsorption isverystrong, large matrixinterference. Toimprovethesensitivityandprecision, for anumberofimprovements toavoid theinterferenceofmatrix andelements lossesfrom which matrixmodifier isagood way
6、.Therefore, thisexperiment nickelas matrixmodifier, add the squid samples ofnickelnitrate solution toimprovethe seleniumin thesamplesolution toenhancethe ashingtemperature,eliminating thematrixinterference.Experimentalresultsshowthatseleniumconcentrationandabsorbencypresentsg
7、oodlinearrelationship,thecorrelationcoefficientreachesthestandardcurve0.9985.Byusingdifferentproportionofabouttwogroupsofmultiplesquidmixedacidtopretreatesamplesanddetermineitsseleniumcontentof0.154 μg/g,therelativestandarddeviationislessthan10%andtherecoveryof90%to110%,preci
8、sionandaccuracyarepreferable,measuringmethodissimpleandfast.[keyword
