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Determination of δ44/40Ca and δ56/54Fe in Geological Materials Combined with a Simplified Method for their Separation Using a Single TODGA Resin Column
Geostandards and Geoanalytical Research ( IF 3.8 ) Pub Date : 2020-07-02 , DOI: 10.1111/ggr.12350
Qiuyun Guan 1, 2 , Yali Sun 1, 3 , Zhaofeng Zhang 4 , Xiaoming Liu 1 , Yajun An 4 , Fang Liu 4 , Shouqian Zhao 1
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A measurement procedure has been developed for the determination of δ44/40Ca and δ56/54Fe in geological samples by multi‐collector inductively coupled plasma‐mass spectrometry (MC‐ICP‐MS) and thermal ionisation mass spectrometry (TIMS), combined with a single TODGA resin column for their separation. Using the TODGA resin for separation of geological materials, Fe and Ca ions were eluted by using 8 ml of 1.5 mol l−1 HNO3 and 8 ml of 2 mol l−1 HCl, respectively, and their recovery was 99.7 ± 0.4% (n = 3) for the former and 99.4 ± 0.6% (n = 3) for the latter after removal of matrix and interfering elements using 12 ml of 6 mol l−1 HCl. This procedure was validated by the reference materials AGV‐2, BCR‐2 and BHVO‐2. Their Fe and Ca isotope data were comparable to their literature values, confirming a single column containing TODGA resin can be applied to the separation of Fe and Ca in geological samples for determination of their isotope ratios free of measurement bias.

中文翻译:

用单TODGA树脂柱分离简化方法测定地质材料中的δ44/ 40Ca和δ56/ 54Fe

的测量过程已经开发了δ的确定40分之44 Ca和δ 56/54的Fe由多电感耦合等离子体-质谱(MC-ICP-MS)和热电离质谱(TIMS)地质样品中,与单个TODGA树脂柱结合用于分离。使用TODGA树脂分离地质材料,分别使用8 ml 1.5 mol -1的HNO 3和8 ml 2 mol -1的HCl洗脱Fe和Ca离子,其回收率为99.7±0.4%(ñ  = 3)为前和99.4±0.6%(ñ  = 3),用于使用12毫升6摩尔升的后者除去基质和干扰之后的元素-1盐酸。该程序已通过参考材料AGV-2,BCR-2和BHVO-2进行了验证。他们的Fe和Ca同位素数据与文献值相当,证实了含有TODGA树脂的单根色谱柱可用于地质样品中Fe和Ca的分离,以测定其同位素比而无测量偏差。
更新日期:2020-07-02
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