Rare earth element analysis in natural waters by multiple isotope dilution – sector field ICP-MS
Rare earth element analysis in natural waters by multiple isotope dilution – sector field ICP-MS
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DOI：
10.1039/c3ja30332b
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发表时间：
2013-03
影响因子：
3.4
通讯作者：
T. Rousseau;J. Sonke;J. Chmeleff;F. Candaudap;F. Lacan;G. Boaventura;P. Seyler;C. Jeandel
中科院分区：
文献类型：
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作者：
T. Rousseau;J. Sonke;J. Chmeleff;F. Candaudap;F. Lacan;G. Boaventura;P. Seyler;C. Jeandel
稀土元素在地球、海洋和环境科学中是有价值的示踪剂。十四个稳定的稀土元素中，有十个有两个或两个以上的同位素，适合用同位素稀释法进行定量。提出了一种基于等离子体质谱的多同位素稀释法，用于水介质中稀土元素的高精度分析。该方法的关键方面是：(I)通过两个LREE和HREE混合添加溶液灵活地添加10个稀土。(Ii)离线预浓缩和基质去除，对于淡水样品，通过离子层析，对于海水样品，通过铁共沉淀或与NOBIAS™树脂离子层析。(3)扇形场电感耦合等离子体质谱(SF-ICPMS)高灵敏度检测。(6)使用去溶微雾化引入系统来降低多原子BaO和LREE-氧化物对HREE的干扰。该方法适用于一系列淡水到海水类型的样品，并通过SLRS-4、SLRS-5和CASS-5标准物质以及两个GEOTRACES海洋比对样品进行了验证。除La和Ce外，所有稀土元素的长期外精密度RSD均为<；2%。最低采样量淡水为1毫升，海水为50毫升。多峰SF-ICPMS方法在探索水中稀土分馏模式的细微变化和大量样品中的异常方面应该特别有兴趣。
The rare earth elements (REEs) are valuable tracers in the earth, ocean and environmental sciences. Ten out of fourteen stable REEs have two or more isotopes, making them suitable for quantification by isotope dilution. We present a plasma mass spectrometry based multiple isotope dilution method for high precision REE concentration analysis in aqueous media. Key aspects of the method are: (i) flexible spiking of ten REEs via two LREE and HREE mixed spike solutions. (ii) Offline pre-concentration and matrix removal, by ion chromatography for freshwater samples and by iron co-precipitation or ion chromatography with the Nobias™ resin for seawater samples. (iii) High sensitivity detection by sector field-inductively coupled plasma mass spectrometry (SF-ICP-MS). (vi) The use of a desolvation micro-nebulization introduction system to lower polyatomic Ba and LREE-oxide interferences on HREEs. The method is suitable for a range of freshwater to seawater type samples, and was validated against SLRS-4, SLRS-5, and CASS-5 reference materials and two GEOTRACES marine inter-comparison samples. Long-term external precision on all REEs was <2% RSD, except La and Ce. Minimum sample volumes are 1 ml for freshwater and 50 ml for seawater. The multispike SF-ICP-MS method should be of particular interest in exploring subtle variations in aqueous REE fractionation patterns and anomalies in large numbers of samples.