Pb/U fractionation during Nd:YAG 213 nm and 266 nm laser ablation sampling with inductively coupled plasma mass spectrometry
Pb/U fractionation during Nd:YAG 213 nm and 266 nm laser ablation sampling with inductively coupled plasma mass spectrometry
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DOI：
10.1366/0003702001948565
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发表时间：
2000-10-01
影响因子：
3.5
通讯作者：
Russo, RE
中科院分区：
文献类型：
--
作者：
Liu, HC;Borisov, OV;Russo, RE
通过测量NIST 610合成玻璃中的Pb/U比，研究了激光烧蚀取样过程中的元素分馏。使用波长为213和266 nm的两个Nd：YAG激光器将样品烧蚀到电感耦合等离子体质谱仪中。铅/铀分馏被观察到是类似的两个激光波长，并依赖于辐照度。对于代表性的Pb/U测量，必要的激光辐照度应>0.6 GW/cm（2）。然而，如果激光束最初聚焦在样品表面附近，则分馏增加，并且受到在单个样品位置处重复脉冲期间形成的凹坑的影响。随着撞击坑深度与半径之比的增加，等离子体采样和/或有效辐照度的降低可能会导致额外的分馏。发现NIST 610玻璃中14种元素的分馏与其氧化物熔化温度的关系曲线之间有很好的相关性。
Elemental fractionation during laser ablation sampling was investigated by measuring Pb/U ratios in NIST 610 synthetic glass. Two Nd:YAG lasers with wavelengths of 213 and 266 nm were used to ablate the sample into an inductively coupled plasma mass spectrometer. Pb/U fractionation was observed to be similar for both laser wavelengths, and dependent on the irradiance. For representative Pb/U measurements, the necessary laser irradiance should be >0.6 GW/cm(2). However, if the laser beam is initially focused close to the sample surface, fractionation increases and is influenced by the formation of a crater during repetitive pulsing at a single sample location. As the ratio of crater depth to radius increases, plasma sampling and/or an effective irradiance decrease could cause additional fractionation. A good correlation was found between the fractionation of 14 elements in NIST 610 glass and the logarithms of their oxide melting temperatures.