摘要
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.
A method for the determiantion of rare earth elements in biological sampels by inductively coupled plasma mass spectrometry was developed. Oxide ion yield of the rare earth elements (REE) decreased with the increasing of RF power and the sampling depth, or with the decreasing of carrier gas flow rate. The spectral interference arising from 14jPr1t) on 157Gd must be corrected. If the concentration of Ba was high enough, it was necessary to correct the spectral interference arising from 135Ba'\) on 151Eu, and it was not necessary to correct spectral interference arising from 14ftd'^) on 1S9H> etc. in the biological samples under the selected operation parameters. In the biological sample, the major matrix elements, such as K, Na and Ca, result in the suppression of REEs signals and the suppression degree of the Ca is grezter than that of the K and Na. The mussel sample was digested by thd dry ashing, wet digestion with HNO3+H2O2 and HNO3+HClO4, respectively. The analytical results of REEs were consisent with eachother. Detection limits for REEs are 0.001～0.013μg/L. Recoveries of standard addition are 91.7%～125% . REEs in biological samples were determined directly without separation and preconcentration procedure.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1999年第6期621-625,共5页
Chinese Journal of Analytical Chemistry
基金
国家自然科学基金
国家教委留学归国基金资助课题
关键词
生物样品
稀土元素
ICP
MS
贻贝
茶叶
小麦粉
Inductively coupled plasma mass spectrometry, biological sample, rare earth elements
