钙同位素化学分离方法研究
Methodological study of chemical separation of calcium for TIMS measurements
查看参考文献18篇
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文摘
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报道了在本实验室建立的地质样品钙同位素化学分离方法。通过对比不同离子交换柱类型、树脂体积、淋洗酸浓度及类型、上样量及样品岩性等影响化学分离效果的因素,确定了采用AGMP-50(100-200目)树脂及HC1淋洗的化学分离流程。该流程在确保高回收率的条件下实现了Ca与K、Sr等干扰元素的有效分离和质谱测量过程中基体效应的有效控制,经这套化学分离方法提纯的NIST SRM 915a、 IAPSO大西洋标准海水及一些USGS标样的测试结果与文献值在误差范围内一致,表明本文建立的化学分离流程可满足热电离质谱(TIMS)高精度测定地质样品钙同位素的要求。 |
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其他语种文摘
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A chemical procedure of separating calcium from geological samples was established at our laboratory. This procedure, adopting AG MP-50 (100-200 mesh) cation resin as ion exchange media and HC1 as rinsing acid, was based on detailed evaluations on a series of factors, such as column types, resin volumes, acid types and concentrations, the sample loading amounts and the lithology, etc., which could generate biases on separation of calcium from matrix elements. This procedure could obtain nearly complete recovery and good separation of calcium from matrix elements at the same time. Moreover, NIST SRM 915a, IAPSO seawater and several USGS standards were passed through the procedure and showed good consistency with the documented results within error. Thus, our procedure ensures the possibility of high-precision and accurate Ca isotope measurements on TIMS for various types of geological samples. |
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来源
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地球化学
,2015,44(5):469-476 【核心库】
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关键词
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钙同位素
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化学分离
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淋洗曲线
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TIMS测试
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地址
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中国科学院广州地球化学研究所, 同位素地球化学国家重点实验室, 广东, 广州, 510640
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0379-1726 |
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学科
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地质学 |
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基金
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国家自然科学基金
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中国科学院广州地球化学研究所同位素地球化学国家重点实验室基金
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文献收藏号
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CSCD:5509309
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