RECENT DEVELOPMENTS IN INDUCTIVELY-COUPLED PLASMA MAGNETIC-SECTOR MULTIPLE COLLECTOR MASS-SPECTROMETRY
RECENT DEVELOPMENTS IN INDUCTIVELY-COUPLED PLASMA MAGNETIC-SECTOR MULTIPLE COLLECTOR MASS-SPECTROMETRY
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DOI：
10.1016/0168-1176(95)04200-5
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发表时间：
1995-08-31
期刊：
影响因子：
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通讯作者：
TEAGLE, D
中科院分区：
文献类型：
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作者：
HALLIDAY, AN;LEE, DC;TEAGLE, D
本文介绍了使用电感耦合等离子体源磁扇形多收集器质谱仪进行同位素测量的进展，并介绍了旨在进一步评估该仪器功能的新实验结果。通过与已知成分的参考溶液比较，表明使用标准溶液可以精确测量痕量元素比率，例如Rb/Sr，无需同位素稀释。同样，使用新型宽飞行管，可以同时准确测量 Pb 同位素组成和 U/Pb 比率，无需同位素稀释。故意纳入运行条件（射频功率）变化的影响对于测量痕量元素比率而言非常重要，但对于质量偏差和干扰校正同位素组成而言则不显着。最后，结果表明，通过溶液雾化，甚至通过复杂硅酸盐的直接激光烧蚀，可以相对容易地确定像W这样难熔元素的精确和准确的同位素组成。此类实验中的光谱干扰可以忽略不计。这些实验凸显了这一新领域为核科学、地球科学、环境科学和医学科学中迄今为止困难的同位素测量提供的巨大潜力。即使存在同量异位素干扰，也可以在一系列运行条件下进行高精度、可重复的同位素测量。使用相似质量的第二个元素精确校正质量歧视的能力、对难以电离的元素的极高灵敏度、激光烧蚀工作的演示能力以及同时测量宽质量范围的能力，使该仪器比其他更传统的同位素测量技术具有主要优势。
This paper describes advances in isotopic measurements that have been made with an inductively coupled plasma source magnetic sector multiple collector mass spectrometer and presents results of new experiments aimed at further evaluating the instrument's capability. It is shown using standard solutions that trace element ratios such as Rb/Sr can be measured precisely without isotope dilution by comparison with reference solutions of known composition. Similarly, using a new wide flight tube, Pb isotopic compositions and U/Pb ratios can be accurately measured simultaneously without isotope dilution. The effects of deliberately including changes in the running conditions (r.f. power) are shown to be significant for measuring trace element ratios but not for mass bias and interference-corrected isotopic compositions. Finally, it is demonstrated that precise and accurate isotopic compositions of elements as refractory as W can be determined relatively easily by solution nebulization and even by direct laser ablation of complex silicates. Spectral interferences in such experiments are negligible. These experiments serve to highlight the remarkable potential that this new field offers for hitherto difficult isotopic measurements in nuclear, earth, environmental and medical sciences. Isotopic measurements can be made that are reproducible at high precision through a range of running conditions, even in the presence of isobaric interferences. The ability to correct for mass discrimination accurately using a second element of similar mass, the very high sensitivity for elements that are otherwise difficult to ionize, the demonstrated capability for laser ablation work and the ability to measure through a wide mass range simultaneously give this instrument major advantages over other more traditional techniques of isotopic measurement.