ICP-MS法测定磷酸二氢钾中杂质元素

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。

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

11 impurities analysis methods for determination of Be，Mg，Ni，Cu，Zn，As，Se，Cd，Sb，Tl，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%～8.60%.The accuracy and precision of the methods both could meet the requirements.These methods are rapid，simple，and applicable for the analysis of various impurity elements in potassium dihydrogen phosphate.