饮用水中19种金属元素快速检测方法的建立

目的建立了电感耦合等离子体质谱法（ICP—MS）同时测定饮用水中铝、铜、锌、硒、砷、汞、镉、铅、铁、锰、钼、锡、铍、锑、镍、钡、银、铬、铊等19种金属元素含量的快速检测方法。方法对仪器工作参数进行优化，选取7Li，45Sc，72Ge，115In，209Bi作为测定元素的内标元素，有效克服了基体效应、接口效应及仪器波动所产生的影响，利用八极杆碰撞／反应池技术，消除多原子离子对待测元素的干扰。结果19种金属元素在测定的含量范围内标准曲线线性关系良好，相关系数都在0．9992以上，方法检出限为0．002～0．444μg／L，定量限为0．006—1．480μg/L，低、中、高含量水样加标回收率为85．9％～105．5％，相对标准偏差（RSD）为0．60％-5．65％（n=6）。结论该法具有操作简便、干扰少、分析速度快、灵敏度高、结果准确可靠等优点，是测定饮用水中金属元素含量的理想方法。

A Study on Rapid Determination Method of 19 Metal Elements in Drinking Water

Objective To establish a rapid determination method of 19 metal elements in drinking water by ICP- MS. Methods Optimizing the operating parameters of instrument, The 7Li, 45Sc, 72Ge, 115In, 209Bi were chosen as internal standard elements so that the effect of matrix, interface and instrument fluctuation was overcome effectively, collision/reaction technology was used to eliminate the interference because of more atomic ion. Results Satisfactory linearity of working curves of 19 elements was obtained, the correlation coefficients were all more than 0. 999 2, detection limits were between 0. 002 0. 444 μg/L, the RSD of parallel samples were between 0. 60% to 5.65% （n = 6）, spiked recoveries of samples were between 85.9% to 105.5%. Conclusion The method is simple, quick, less interference, sensitive and accurate, it can be used as perfect method to determine metal elements content in drinking water.