Precise determination of mass-dependent variations in the isotopic composition of molybdenum using MC-ICPMS.
Precise determination of mass-dependent variations in the isotopic composition of molybdenum using MC-ICPMS.
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DOI：
10.1021/ac000829w
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发表时间：
2001-03
影响因子：
7.4
通讯作者：
A. Anbar;K. A. Knab;J. Barling
中科院分区：
文献类型：
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作者：
A. Anbar;K. A. Knab;J. Barling
我们提出了一种使用多收集器磁扇形电感耦合等离子体质谱（MC-ICPMS）精确测定样品和参比标准之间Mo同位素组成的质量依赖性差异的分析方法。Zr或Ru“元素尖峰”用于校正仪器质量偏差。使用1-10 μ g Mo，可以确定95Mo/97Mo的差异，精度为+/-0.2%o （+2sigma）。在校正了来自任一尖峰元件的等压干扰后，其他比率的精度可能相似。这种方法有助于研究自然界和实验室生产的材料中Mo同位素组成的质量依赖变化。在实验室离子交换色谱中，我们观察到Mo同位素的分馏约为1.5%o/amu，天然MoS2和实验室标准之间的偏移约为0.3%o/amu。
We present an analytical approach for the precise determination of mass-dependent differences in the isotopic composition of Mo between samples and reference standards using multiple-collector magnetic sector inductively coupled plasma mass spectrometry (MC-ICPMS). Either Zr or Ru "element spikes" are employed to correct for instrumental mass bias. Differences in 95Mo/97Mo can be determined to a precision of +/-0.2%o (+2sigma) using 1-10 microg of Mo. Similar precision is possible for other ratios after correction for isobaric interferences from either spike element. This approach facilitates study of mass-dependent variations in the isotopic composition of Mo in nature and in materials produced by laboratory processes. We observe fractionation of Mo isotopes of approximately 1.5%o/amu during ion-exchange chromatography in the laboratory and a shift of approximately 0.3%o/amu between natural MoS2 and a laboratory standard.