In-situ precise isotopic analysis of tungsten using laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) with time resolved data acquisition
In-situ precise isotopic analysis of tungsten using laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) with time resolved data acquisition
复制标题
使用激光烧蚀多接收器电感耦合等离子体质谱 (LA-MC-ICP-MS) 和时间分辨数据采集对钨进行原位精确同位素分析
DOI：
10.1039/b107737f
复制
发表时间：
2002
影响因子：
3.4
通讯作者：
T. Hirata
中科院分区：
文献类型：
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作者：
T. Hirata
用激光烧蚀多接收电感耦合等离子体质谱（LA-MC-ICP-MS）测量固体地质样品中的182 W/183 W、184 W/183 W和186 W/183 W比值。时间分辨分析（TRA）数据采集技术用于最大限度地减少瞬态信号中的积分损失，并最大限度地减少由于低信号强度数据的积分而降低测量精度和准确度的风险。182 W/183 W、184 W/183 W和186 W/183 W的测量精度分别为0.015%、0.031%和0.039%
（2σ），当使用优化的积分区域和扩展稳定器时。这些值仅比通过常规溶液雾化测量获得的值差3倍。
然而，使用激光烧蚀技术用于同位素分析的W的总量仅为20 ng，这比溶液雾化方法所需的典型量少得多（0.1-0.01）。在纯钨丝和黑钨矿样品中测得的W同位素比与化学试剂的结果非常一致：182 W/183 W = 1.85147 ± 0.00022，184 W/183 W = 2.14169 ± 0.00022和186 W/183 W = 1.98764 ± 0.00021（2σ）归一化为186 W/184 W = 0.92805，通过常规雾化获得。使用LA-MC-ICP-MS的内部精密度足以检测182 W/183 W同位素比的自然变化，这些变化源自182 Hf的放射成因贡献（通常为0.04- 0.2%）。
Measurements of 182W/183W, 184W/183W and 186W/183W ratios in solid geological samples have been carried out using laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS). A time resolved analysis (TRA) data acquisition technique was used to minimise integration losses in transient signals and also to minimise the risk of lowering the precision and accuracy of the measurements due to integration of low signal intensity data. The resulting precisions of the 182W/183W, 184W/183W and 186W/183W measurements were about 0.015%, 0.031% and 0.039%
(2σ) when an optimised integration area and an expansion stabiliser were used. These values are only 3-times worse than those achieved by conventional solution nebulisation measurements.
However, the total amount of W used for isotopic analysis using the laser ablation technique was only 20 ng, which is much less (0.1–0.01) than the typical amount required for the solution nebulisation method. Measured W isotopic ratios in a pure W filament and wolframite samples showed excellent agreement with those from chemical reagents: 182W/183W = 1.85147 ± 0.00022, 184W/183W = 2.14169 ± 0.00022 and 186W/183W = 1.98764 ± 0.00021 (2σ) normalised to 186W/184W ≡ 0.92805, obtained by conventional nebulisation. The internal precision using LA-MC-ICP-MS was sufficient to detect the natural variations in the 182W/183W isotopic ratio originating from radiogenic contributions of 182Hf (typically 0.04– 0.2%).
Hirata, T.：“使用多收集器感应耦合等离子体质谱法结合改进的质量辨别效应外部校正方法进行铅同位素分析。”
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