Evaluation of Laser Ablation in Liquid (LAL) technique as a new sampling technique for elemental and isotopic analysis using ICP-mass spectrometry
Evaluation of Laser Ablation in Liquid (LAL) technique as a new sampling technique for elemental and isotopic analysis using ICP-mass spectrometry
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DOI：
10.1039/c0ja00200c
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发表时间：
2011-07
影响因子：
3.4
通讯作者：
S. Okabayashi;T. Yokoyama;Y. Kon;S. Yamamoto;T. Yokoyama;T. Hirata
中科院分区：
文献类型：
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作者：
S. Okabayashi;T. Yokoyama;Y. Kon;S. Yamamoto;T. Yokoyama;T. Hirata
液体激光烧蚀(LAL)被广泛应用于各种材料的微细加工或纳米粒子的生产。在本研究中，我们评估了LAL作为一种新的采样技术用于固体样品的元素和同位素分析的分析能力。将固体样品置于去离子水中，利用工作在基波(780 Nm)的钛S飞秒激光在水中进行激光烧蚀。激光诱导的样品颗粒被直接捕获并高效地收集在环境水中。我们已经研究了在LAL取样过程中可能的元素和同位素分馏。用电感耦合等离子体质谱(ICPMS)对不同烧蚀条件下得到的样品颗粒进行了5种同位素比值(208Pb/238U、238U/232Th、208Pb/206Pb、56Fe/54Fe和57Fe/54Fe)的测量。一系列实验表明，无论是在较高的通量(>；200J cm−2)或较高的重复频率(>；250赫兹)下，所得到的208Pb/238U比率与使用源材料获得的结果(>；1%)有显著差异(因此，NIST SRM610)。对于~(238)U/~(232)Th、~(208)Pb/~(206)Pb、~(56)Fe/~(54)Fe和~(57)Fe/~(54)Fe，在所用的LAL条件下，测量值没有明显变化(<；0.5%)。这些数据清楚地表明，只要仔细优化激光烧蚀条件，LAL技术就可以用于元素和同位素分析。
Laser ablation in liquid (LAL) is widely used for the micro fabrications or production of nano-particles of various materials. In this study, we have evaluated the analytical capability of the LAL as a new sampling technique for elemental and isotopic analysis of solid samples. The solid sample was set into the deionized water, and the laser ablation was carried out within the water using a Ti:S femtosecond laser operating at fundamental wavelength (780 nm). The laser-induced sample particles were directly trapped and collected in the ambient water with high efficiency. We have investigated the possible elemental and isotopic fractionation during the LAL sampling. Five isotopic ratios (208Pb/238U, 238U/232Th, 208Pb/206Pb, 56Fe/54Fe and 57Fe/54Fe) were measured on the resulting sample particles obtained with various ablation conditions (fluence and repetition rate) using ICP-mass spectrometry (ICP-MS). Series of experiments revealed that either with the higher fluence (>200 J cm−2) or with higher repetition rate (>250 Hz), the resulting 208Pb/238U ratios varied significantly (>1%) from those obtained with source materials (hence, NIST SRM 610). For the 238U/232Th, 208Pb/206Pb, 56Fe/54Fe and 57Fe/54Fe ratios, the measured values did not vary measurably (<0.5%) under the LAL conditions employed here. The data obtained here demonstrate clearly that the LAL technique can be applied for the elemental and isotopic analyses with the careful optimization of laser ablation conditions.