现代食品现代食品XIANDAISHIPIN209209/分析检测分析检测AnalysisandTestingdoi:10.16736/j.cnki.cn41-1434/ts.2022.24.055电感耦合等离子体质谱法测定中华绒螯蟹中稀土元素的不确定度分析EvaluationofUncertaintyinDeterminationofRareEarthElementsinEriocheirsinensisbyInductivelyCoupledPlasmaMassSpectrometry◎梁凤玲,郑扬,黄芳(苏州市农产品质量安全监测中心,江苏苏州215104)LIANGFengling,ZHENGYang,HUANGFang(SuzhouAgriculturalProductsQualityandSafetyMonitoringCenter,Suzhou215104,China)摘要:采用电感耦合等离子体质谱法对中华绒螯蟹中稀土元素含量进行测定,根据不确定度评定的相关标准,建立了数学测量模型,对检测过程中的不确定度进行评定,包括对样品称量、消解过程、消化液定容,标准工作溶液配制、标准曲线拟合、仪器测定等不确定度分量进行分析。结果显示,以稀土元素镝为例,当中华绒螯蟹样品中镝含量为0.00623mg·kg-1时,其扩展不确定度为0.00147mg·kg-1(k=2)。样品的消解过程和标准曲线的拟合是不确定度的关键影响因子,在实验过程中应予以关注。关键词:电感耦合等离子体质谱法;中华绒螯蟹;稀土元素;不确定度Abstract:ThecontentofrareearthelementsinEriocheirsinensiswasdeterminedbyinductivelycoupledplasmamassspectrometry.Accordingtotherelevantstandardsofuncertaintyevaluation,amathematicalmeasurementmodelwasestablishedtoevaluatetheuncertaintyofthedetectionprocess,includingtheanalysisofuncertaintycomponentssuchassampleweighing,digestionprocess,digestionsolutionvolumedetermination,standardworkingsolutionpreparation,standardcurvefitting,andinstrumentmeasurement.Theresultsshowedthattheexpandeduncertaintywas0.00147mg·kg-1(k=2),whenthedysprosiumcontentoftheEriocheirsinensissamplewas0.00623mg·kg-1.Thedigestionprocessofthesampleandthefittingofthestandardcurvearethekeyfactorsaffectingtheuncertainty,whichshouldbepaidattentiontoduringtheexperiment.Keywords:inductivelycoupledplasmamassspectrometry;Eriocheirsinensis;rareearthelements;uncertainty中图分类号:O657.63中华绒螯蟹又称河蟹、大闸蟹,滋味鲜美,具有较高的营养价值和经济价值,是我国淡水产养殖的品种之一。稀土元素是17种特殊元素的统称,包括15种镧系元素和钪、钇。我国是第...