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目的建立电感耦合等离子体质谱(ICP-MS)同时测定生活饮用水输配水设备卫生安全性试验水样中的15种元素方法,以应用于大量实际样品检测。方法采用ICP-MS。用1%HNO3配制铁浓度为0、0.05、0.1、0.5、1.0、2.0、5.0、10.0μg/mL;铝、铬、锰、镍、铜、锌、砷、硒、银、镉、锡、锑、钡、铅为0、0.5、1.0、5.0、10.0、20.0、50.0、100.0ng/mL的标准系列。以6Li,45Sc,72Ge,115In,209Bi作在线内标,调节仪器测定参数,水样酸化后直接进样上机测定。测定样品的加标回收率,国家级有证标准物质和实际水样。结果该方法测定元素的线性相关系数均>0.9992;7次测定模拟水样的相对标准偏差,除硒为13.3%外,其他14种元素均<8.7%;测定高中低浓度加标水样,除铬外,其他元素加标回收率在80%～113%之间;测定国家标准参考物质GSBZ5009-88、GS-BZ5009-90、美国高纯标准参考物质CRM-IsdA,除Ag外,其余元素测定值均在标准值范围内,具有良好的准确度。结论该方法检出限低,线性范围宽,元素之间的干扰相对少,能适应含一定盐分的配置浸泡水,是高效可行的方法。
Objective To establish an ICP-MS method for the simultaneous determination of 15 elements in the health and safety of drinking water distribution equipment to apply to a large number of actual samples. Methods ICP-MS was used. With 1% HNO3 formulated iron concentration of 0,0.05,0.1,0.5,1.0,2.0,5.0,10.0μg / mL; aluminum, chromium, manganese, nickel, copper, zinc, arsenic, selenium, silver, cadmium, tin, antimony , Barium, lead 0,0.5,1.0,5.0,10.0,20.0,50.0,100.0ng / mL of the standard series. To 6Li, 45Sc, 72Ge, 115In, 209Bi for online internal standard, adjust the instrument to determine the parameters, the water sample acidification directly into the machine on the determination. Determination of the sample spike recovery, national certified reference material and the actual water samples. Results The linear correlation coefficient of the method was> 0.9992. The relative standard deviations of the seven simulated water samples were all less than 8.7% except for the selenium content of 13.3% Chromium, the recovery of other elements spiked between 80% and 113%; Determination of national standards reference materials GSBZ5009-88, GS-BZ5009-90, the United States high purity standard reference material CRM-IsdA, except for Ag, the other elements were measured Values are within the standard value range, with good accuracy. Conclusion The method has the advantages of low detection limit, wide linear range and relatively few interference between elements. It can adapt to the configuration of soaking water with a certain salt content, which is an efficient and feasible method.