A simple two-stage column chromatographic separation scheme for strontium, lead, neodymium and hafnium isotope analyses in geological samples by thermal ionization mass spectrometry or multi-collector inductively coupled plasma mass spectrometry
A simple two-stage column chromatographic separation scheme for strontium, lead, neodymium and hafnium isotope analyses in geological samples by thermal ionization mass spectrometry or multi-collector inductively coupled plasma mass spectrometry
复制标题
采用热电离质谱或多接收器电感耦合等离子体质谱分析地质样品中的锶、铅、钕和铪同位素的简单两级柱色谱分离方案
DOI：
10.1002/jssc.201900579
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发表时间：
2019-10-01
影响因子：
3.1
通讯作者：
Pu, Wei
中科院分区：
文献类型：
--
作者：
Lei, Huan-Ling;Yang, Tao;Pu, Wei
本文提出了一种两段柱分离方案，用于同时分离地质样品中的锶、铅、钕和氢。第一层柱由三层树脂(AG50W-X8离子交换树脂+Ln专用树脂+锶专用树脂)组成，将高场强元素+稀土元素、锶和铅从基质中分离出来。随后，使用1mLLn专用树脂从第二柱上的高场强元素+稀土元素组分中进一步分离ND和Hf。对于一批样品(20-30个)，两级柱过程可以在大约七个半小时内完成。分离出的锶组分可用于热电离质谱仪的同位素比值测量。在用多收集器电感耦合等离子体质谱进行同位素分析之前，将铅、钕和氢的部分转化为硝酸盐。通过对四个国际岩石标准(BCR-2、AGV-2、BHVO-2和JB-3)的分析，证实了这一新方法的可行性，得到的同位素比率与其他已公布的数据非常一致。
Here, a two-stage column separation scheme is developed for the concomitant isolation of Sr, Pb, Nd, and Hf from geological samples. The first column, which consists of three resin layers (AG50W-X8 ion exchange resin + Ln specific resin + Sr specific resin), separates the high field strength element + rare earth element, Sr and Pb from the matrices. Subsequently, Nd and Hf are further separated from the high field strength element + rare earth element fraction on the second column using 1 mL of Ln specific resin. The two-stage column process can be completed within about seven and a half hours for a batch of samples (20-30). The separated Sr fraction was ready for isotope ratio measurements by thermal ionization mass spectrometry. The Pb, Nd, and Hf fractions were converted to nitrate prior to isotopic analyses by multi-collector inductively coupled plasma mass spectrometry. The feasibility of this new procedure is confirmed by the analyses of four international rock standards (BCR-2, AGV-2, BHVO-2, and JB-3), which yielded isotope ratios that were in good agreement with other published data.