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目的建立生活饮用水中16种稀土元素的电感耦合等离子体质谱(ICP-MS)快速测定法,并测定水样中上述16种元素的含量。方法采集北京市生活饮用水水样,以雾化器流速为0.90 L/min,辅助气流速为1.40 L/min,射频发生器功率为1 300 W,等离子气体流速为15.0 L/min,用ICP-MS法快速测定样品中钪、钇、镧、铈、镨、钕、钐、铕、钆、铽、镝、钬、铒、铥、镱和镥16种稀土元素。结果 16种稀土元素在0μg/L~1.00μg/L内线性良好,相关系数除钪元素外其他元素均大于0.999,检出限为0.004μg/L~0.050μg/L,各元素在低、中和高3个浓度水平加标回收率为84.3%~109.2%,相对标准偏差为1.2%~9.4%。在检测的40份水样中,检出钪、钇、镧、铈、钕、钐、铕7种元素检出外,其余9种元素测定结果均低于检出限。结论本方法操作简单快速、灵敏度高,可用于生活饮用水中多种稀土元素同时测定。
Objective To establish a rapid determination method for 16 kinds of rare earth elements in drinking water by inductively coupled plasma mass spectrometry (ICP-MS) and to determine the contents of these 16 elements in water sample. Methods The samples of drinking water in Beijing were collected. The flow rate of the atomizer was 0.90 L / min, the auxiliary gas flow was 1.40 L / min, the RF generator power was 1 300 W and the plasma gas flow was 15.0 L / min. ICP -MS method for the determination of 16 rare earth elements such as scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, gallium, ytterbium and gallium. Results The results showed that the contents of 16 rare earth elements in the range of 0μg / L to 1.00μg / L were good, the correlation coefficients were all greater than 0.999 except scandium, the limits of detection were 0.004μg / L ~ 0.050μg / L, The recoveries of spiked and spiked samples were 84.3% -109.2% and the relative standard deviations were 1.2% -9.4%. Among the 40 water samples detected, seven elements of scandium, yttrium, lanthanum, cerium, neodymium, samarium and europium were detected, and the other nine elements were detected below the detection limit. Conclusion The method is simple, rapid and sensitive. It can be used for the simultaneous determination of many rare earth elements in drinking water.