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建立了一种采用电感耦合等离子体质谱(ICP-MS)同时测定重晶石中4种有害金属元素(As,Cd,Hg和Pb)的方法。各元素的线性关系良好(r=0.9995~1.0000),各元素的回收率为92.6%~102.5%,相对标准偏差(RSD)为2.3%~4.4%。对比研究了KMnO_4-K_2S_2O_8消解法、王水水浴加热消解法和王水回流消解法3种不同消解方法的效果。消解效果无显著性的差异,但对于Hg元素测定,王水水浴加热消解效果较好。
A method for the simultaneous determination of 4 kinds of harmful metal elements (As, Cd, Hg and Pb) in barite by inductively coupled plasma mass spectrometry (ICP-MS) was established. The linearity of each element was good (r = 0.9995 ~ 1.0000). The recoveries of various elements ranged from 92.6% to 102.5%. The relative standard deviations (RSDs) ranged from 2.3% to 4.4%. The effects of KMnO_4-K_2S_2O_8 digestion method, Wang water bath digestion method and aqua regia digestion method were compared. Digestion effect no significant difference, but for the determination of Hg element, Wang water bath digestion heating effect is better.