电感耦合等离子体质谱法测定铁矿石中的痕量钼元素
Determination of Trace Element Molybdenum in Iron Ore by Inductively Coupled Plasma Mass Spectrometry
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摘要: 国家一级铁矿石标准物质中定值元素的量较少，在多元素测定过程中缺乏有效的监控手段，这在一定程度上限制了铁矿石中可测定的元素种类，不能为现代勘查地球化学提供科学的数据支撑，制约了勘查地球化学的发展。本工作采用电感耦合等离子体质谱法（ICP-MS）测定铁矿石中的Mo，并对仪器条件进行了优化。实验发现，Mo元素受到的干扰主要来源于元素Zr的同质异位素和元素Fe的多原子离子干扰，不同质量数的Mo受到的干扰程度不同，其中95Mo受到的干扰最小，因此选择95Mo作为测定Mo的最佳同位素。在优化的仪器条件下，Mo的检出限为0.014 μg/g，当样品溶液稀释倍数达到1 000时，基体效应可降至最小，且样品的回收率在91%~117%之间，方法精密度为2.06%~5.01%。该方法准确可靠，能够为勘查地球化学提供有效的数据支撑。
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关键词:
- 铁矿石 /
- 痕量 /
- 钼 /
- 电感耦合等离子体质谱仪（ICP-MS）
Abstract: The amount of the value elements in the national standard iron ore reference material is small, and there is no effective means of monitoring for determination of other elements, which limits the determination of the elements in iron ore to a certain extent. In this case, effective scientific data couldn’t be provided to support modern exploration geochemistry, which restricts the development of prospecting geochemistry. In this study, the method of determining molybdenum by inductively coupled plasma-mass spectrometry (ICP-MS) was established, and the optimum instrument conditions was investigated. At the same time, it was found that the interference of molybdenum mainly came from the elements of zirconium and iron. The interference degree was different for the different mass molybdenum, so the element of 95Mo which has the least interference was chosen as the measurement element. The detection limit of molybdenum was 0.014 μg/g, the recovery rate of the samples was 91%-117%, the precision of the method was 2.06%-5.01%. The method is accurate and reliable, it can provide effective data support for exploration geochemistry.-
Keywords:
- iron ore /
- trace /
- molybdenum /
- inductively coupled plasma-mass spectrometry (ICP-MS)
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