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采用电感耦合等离子体质谱法测定了生物样品中的稀土元素.稀土元素的氧化物离子产率随入射功率和采样深度增加,载气流速减小而降低.在选择的测量条件下,~(141)Pr~(16)O对~(157)Gd的测定可产生严重干扰,必须校正,当样品中钡含量较高时,应考虑校正~(135)Ba对~(151)Eu的干扰.生物样品的主要基体元素K、Na和Ca在浓度较高时,对稀土元素的信号强度均表现出抑制效应,且Ca的抑制程度大于K和Na.比较了干灰化、HNO_3+H_2O_2和HNO_3+HClO_4 3种样品消解方法,结果表明,3种消解方法可得到一致的结果.稀土元素的检出限为0.001～0.013μg/L,标准加入回收率为91.7%～125%,不经分离富集可直接测定生物样品中的超痕量稀土元素.
The rare earth elements in biological samples were determined by inductively coupled plasma mass spectrometry.The yields of oxide ions of rare earth elements decreased with the increase of incident power and sampling depth and the flow rate of carrier gas decreased.Under the selected measurement conditions, ) The determination of ~ (157) Gd by Pr ~ (16) O can cause serious interference and must be corrected. When the content of barium in the sample is high, the interference of ~ (135) Ba ~ (151) Eu should be corrected. The main matrix elements K, Na and Ca showed inhibitory effects on the signal intensity of rare earth elements at higher concentrations, and the inhibition degree of Ca was greater than that of K and Na.Compared with dry ashing, HNO 3 + H 2 O 2 and HNO 3 + The results showed that three kinds of digestion methods could get consistent results.The limit of detection of rare earth elements was 0.001 ~ 0.013μg / L, the standard addition recovery was 91.7% ~ 125%, which was not separated and enriched Ultra-trace rare earth elements in biological samples can be directly measured.