ICP-MS法测定磷酸二氢钾中杂质元素

Detection of impurity elements in potassium dihydrogen phosphate with ICP-MS method

建立了电感耦合等离子体质谱（ICP—MS）法测定磷酸二氢钾中铍、镁、镍、铜、锌、砷、硒、镉、锑、铊、铅等11种杂质元素的分析方法。样品经硝酸消解后进行分析，选用锂、铋、铟、铑元素为内标混合液校正基体干扰。研究结果表明，该方法对11种待测元素的加标回收率范围为86．00％-118．77％，相对标准偏差范围为3．79％～8．60％．方法的准确度和精密度均符合要求。该方法简便、快速，能满足磷酸二氢钾中多种杂质元素同时测定的分析需求。

11 impurities analysis methods for determination of Be, Mg, Ni, Cu, Zn, As, Se, Cd, Sb, TI, and Pb in potassium dihydrogen phosphate by inductively coupled plasma mass spectrometry（ICP-MS） was developed.After the sample was digested by HNO3, the above 11 impurities could be analyzed directly by ICP-MS.Li, Bi, In, and Rh were used to correct the matrix interference.Results showed the standard sample recovery rates of the 11 elements were in the range of 86.00% 118.77%.The relative standard deviation of the 11 elements were in the range of 3.79%N8.60%.The accuracy and precision of the methods both could meet the requirements.These methods are rapid, simple, and applicable for the analysis of various im- purity elements in potassium dihydrogen phosphate.