ICP-AES分析茶叶中Mg和K含量的不确定度评定  

Uncertainty Evaluation of Measurement Results for the Determination of Magnesium and Potassium in Tea by ICP-AES

作　　者：彭彩华[1] 尹平河[1,2] 

机构地区：[1]暨南大学生命科学技术学院化学系,广州市黄埔大道西601号510632 [2]暨南大学分析测试中心,广州市510632

出　　处：《光谱实验室》2011年第1期196-200,共5页Chinese Journal of Spectroscopy Laboratory

基　　金：国家自然科学基金资助项目(20772048);广东省基金(06025194及2005A30503001);863项目(2006AA09Z408)

摘　　要：对用电感耦合等离子体-原子发射光谱法(ICP-AES)测定茶叶中的金属元素Mg、K含量的不确定度来源进行分析和计算。其分析方法的标准不确定度主要来源包括物质称量、线性回归拟合、溶液稀释等过程,并依据不确定度的评定方法计算各不确定度分量,结果表示茶叶中Mg、K的含量依次为1773、16666mg/kg,标准不确定度依次为21.6、648.0mg/kg。Uncertainty of measurement results for the determination of magnesium and potassium in tea by ICP-AES were evaluated.The major impact factors were analyzed and their uncertainty caused by weighing using analytical balance,fitting by linear regression,diluting were evaluated individually.The contents of magnesium and potassium in tea were 1773,16666mg/kg and their uncertainty of measurement were 21.6,648.0mg/kg,respectively.

关 键 词：不确定度 电感耦合等离子体-原子发射光谱法 镁 钾 

分 类 号：O657.31[理学—分析化学]