密封消解ICP—MS测定果冻中5种重金属

摘要

用原子吸收光谱法（AAS）、原子荧光光度法（AFS）和电感耦合等离子体质谱法（ICP—MS）分别测定果冻中痕量元素砷、铅、汞、镉、铬，采用标准曲线法定量分析方法，并对本方法与国家标准方法所得结果进行比较。结果表明，国家标准方法和ICP—MS法均有较好的线性关系，且测定的结果相近。2种方法最低检出限量分别为：国家标准方法中铅0．07ng／ml、镉0．02ng／ml、铬0．1ng／ml、砷0．011ng／ml，汞0．037ng／ml；ICP—MS方法中铅0．02ng／ml、镉0．015ng／ml、铬0．13ng／ml、砷0．047ng／ml、汞0．051ng／ml。ICP—MS法可以同时测定果冻中的5种重金属元素，分析周期短，提高了样品的分析效率。%Contents of As, Pb, Cd, Cr and Hg in jelly were determined by atomic absorption spectrometry ( AAS), atomic fluorescence spectrophotometry (AFS) and inductively coupled plasma mass-spectrography ( ICP- MS). Five elements were determined by standard curve method. The results obtained from three instrumental analy- sis methods were compared, which showed that the 1ear calibration curves for AAS, AFS and ICP-MS were good. The measurement results of these methods were close. The lowest detection limits of As, Pb, Cd, Cr and Hg were 0.011 ng/ml, 0.07 ng/ml, 0.02 ng/ml, 0.1 ng/ml and 0. 037 ng/ml respectively by The national standard meth- od. The lowest detection of limits of As, Pb, Cd, Cr and Hg were 0.047 ng/ml,0.02 ng/ml, 0. 015 ng/ml, 0.13 ng/ml and 0.051 ng/ml respectively by ICP-MS. Simultaneous determination of multiple heavy metal elements in jelly by ICP-MS. ICP-MS had advantages of short period and high efficiency of analysis.