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首页> 外文期刊>Journal of Asian earth sciences >Determination of element/Ca ratios in foraminifera and corals using cold- and hot-plasma techniques in inductively coupled plasma sector field mass spectrometry
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Determination of element/Ca ratios in foraminifera and corals using cold- and hot-plasma techniques in inductively coupled plasma sector field mass spectrometry

机译:电感耦合等离子体扇区质谱中冷和热等离子体技术测定有孔虫和珊瑚中的元素/钙比

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摘要

We have developed a rapid and precise procedure for measuring multiple elements in foraminifera and corals by inductively coupled plasma sector field mass spectrometry (1CP-SF-MS) with both cold- [800 W radio frequency (RF) power] and hot- (1200 W RF power) plasma techniques. Our quality control program includes careful subsampling protocols, contamination-free workbench spaces, and refined plastic-ware cleaning process. Element/Ca ratios are calculated directly from ion beam intensities of ~(24)Mg, ~(27)Al, ~(43)Ca, ~(55)Mn, ~(57)Fe, ~(86)Sr, and ~(138)Ba, using a standard bracketing method. A routine measurement time is 3-5 min per dissolved sample. The matrix effects of nitric acid, and Ca and Sr levels, are carefully quantified and overcome. There is no significant difference between data determined by cold- and hot-plasma methods, but the techniques have different advantages. The cold-plasma technique offers a more stable plasma condition and better reproducibility for ppm-level elements. Long-term 2-sigma relative standard deviations (2-RSD) for repeat measurements of an in-house coral standard are 0.32% for Mg/Ca and 0.43% for Sr/Ca by cold-plasma 1CP-SF-MS, and 0.69% for Mg/Ca and 0.51% for Sr/Ca by hot-plasma ICP-SF-MS. The higher sensitivity and enhanced measurement precision of the hot-plasma procedure yields 2-RSD precision for umol/mol trace elements of 0.60% (Mg/Ca), 9.9% (Al/Ca), 0.68% (Mn/Ca), 2.7% (Fe/Ca), 0.50% (Sr/Ca), and 0.84% (Ba/Ca) for an in-house foraminiferal standard. Our refined ICP-SF-MS technique, which has the advantages of small sample size (2-4 μg carbonate consumed) and fast sample throughput (5-8 samples/hour), should open the way to the production of high precision and high resolution geo-chemical records for natural carbonate materials.
机译:我们已经开发了一种快速而精确的程序,用于通过冷耦合[800 W射频(RF)功率]和热耦合(1200 W)的电感耦合等离子体扇区质谱(1CP-SF-MS)测量有孔虫和珊瑚中的多种元素W RF功率)等离子技术。我们的质量控制计划包括仔细的二次采样方案,无污染的工作台空间以及精致的塑料制品清洁过程。元素/ Ca比直接根据〜(24)Mg,〜(27)Al,〜(43)Ca,〜(55)Mn,〜(57)Fe,〜(86)Sr和〜的离子束强度直接计算(138)Ba,使用标准包围法。每个溶解样品的常规测量时间为3-5分钟。硝酸的基质效应以及Ca和Sr的含量经过仔细量化和克服。冷等离子体和热等离子体方法确定的数据之间没有显着差异,但是这些技术具有不同的优势。冷等离子体技术可为ppm级元素提供更稳定的等离子体条件和更好的重现性。重复测量内部珊瑚标准品的长期2σ相对标准偏差(2-RSD)对于Mg / Ca为0.32%,通过冷等离子体1CP-SF-MS对Sr / Ca为0.43%,为0.69热等离子体ICP-SF-MS测定的Mg / Ca含量为%,Sr / Ca的含量为0.51%。热等离子体程序的更高灵敏度和更高的测量精度可为umol / mol微量元素提供0.60%(Mg / Ca),9.9%(Al / Ca),0.68%(Mn / Ca),2.7的2-RSD精度对于室内有孔虫标样,其含量为(Fe / Ca),0.50%(Sr / Ca)和0.84%(Ba / Ca)。我们完善的ICP-SF-MS技术具有小样品量(消耗2-4μg碳酸盐)和快速样品通量(5-8个样品/小时)的优势,应该为高精度和高产量的生产开辟道路。解析天然碳酸盐材料的地球化学记录。

著录项

  • 来源
    《Journal of Asian earth sciences》 |2014年第25期|115-122|共8页
  • 作者单位

    High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, Taipei 10617, Taiwan, ROC;

    High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, Taipei 10617, Taiwan, ROC;

    High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, Taipei 10617, Taiwan, ROC;

    High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, Taipei 10617, Taiwan, ROC;

    High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, Taipei 10617, Taiwan, ROC;

    High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, Taipei 10617, Taiwan, ROC;

    Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia;

    Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ICP-SF-MS; Element/Ca ratio; Cold-plasma; Hot-plasma; Foraminifera; Corals;

    机译:ICP-SF-MS;元素/钙比;冷等离子体热等离子体有孔虫珊瑚色;

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