Measurement of the Isotopic Composition of Molybdenum in Geological Samples by MC‐ICP‐MS using a Novel Chromatographic Extraction Technique
Measurement of the Isotopic Composition of Molybdenum in Geological Samples by MC‐ICP‐MS using a Novel Chromatographic Extraction Technique
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DOI：
10.1111/j.1751-908x.2013.00279.x
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发表时间：
2014-09
影响因子：
3.8
通讯作者：
Jie Li;Xi-rong Liang;Li-feng Zhong;Xuan‐Ce Wang;Zhong‐Yuan Ren;Sheng-ling Sun;Zhao-Feng Zhang;
中科院分区：
文献类型：
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作者：
Jie Li;Xi-rong Liang;Li-feng Zhong;Xuan‐Ce Wang;Zhong‐Yuan Ren;Sheng-ling Sun;Zhao-Feng Zhang;
提出了一种多接收电感耦合等离子体质谱（MC-ICP-MS）测定地质样品中钼同位素比值的预富集新方法。该方法基于使用微孔丙烯酸酯聚合物树脂（Amberlite CG-71）负载的N-苯甲酰基-N-苯基羟胺（BPHA）通过萃取色谱法分离Mo。通过优化程序，Mo可以简单有效地从几乎所有的基质元素中分离出来，只需一次通过小体积的BPHA树脂（0.5 ml）。这种分离富集钼的技术具有高选择性、柱效和回收率（~ 100%）以及低总程序空白（~ 0.18 ng）的特点。在消化和柱分离之前将100 Mo-97 Mo双掺料与样品混合，这使得能够通过MC-ICP-MS以< 0.09‰（δ98/95 Mo，2s）的测量再现性测定天然质量依赖性同位素分馏。在本研究中测量的IAPSO海水参考物质的平均δ98/95 MoSRM 3134（NIST SRM 3134 Mo参考物质;批号891307）组成为2.00 ± 0.03‰（2s，n = 3），这与先前公布的值一致。该方法可用于各种地质样品中钼同位素的快速、高效测定。
A novel preconcentration method is presented for the determination of Mo isotope ratios by multi‐collector inductively coupled plasma‐mass spectrometry (MC‐ICP‐MS) in geological samples. The method is based on the separation of Mo by extraction chromatography using N‐benzoyl‐N‐phenylhydroxylamine (BPHA) supported on a microporous acrylic ester polymeric resin (Amberlite CG‐71). By optimising the procedure, Mo could be simply and effectively separated from virtually all matrix elements with a single pass through a small volume of BPHA resin (0.5 ml). This technique for separation and enrichment of Mo is characterised by high selectivity, column efficiency and recovery (~ 100%), and low total procedural blank (~ 0.18 ng). A 100Mo‐97Mo double spike was mixed with samples before digestion and column separation, which enabled natural mass‐dependent isotopic fractionation to be determined with a measurement reproducibility of < 0.09‰ (δ98/95Mo, 2s) by MC‐ICP‐MS. The mean δ98/95MoSRM 3134 (NIST SRM 3134 Mo reference material; Lot No. 891307) composition of the IAPSO seawater reference material measured in this study was 2.00 ± 0.03‰ (2s, n = 3), which is consistent with previously published values. The described procedure facilitated efficient and rapid Mo isotopic determination in various types of geological samples.