Particle size-related elemental fractionation in laser
Particle size-related elemental fractionation in laser
复制标题
激光中与粒径相关的元素分级
DOI：
10.1039/c5ja00349k
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发表时间：
2015
影响因子：
3.4
通讯作者：
M. Fujiwara and N. Furuta
中科院分区：
文献类型：
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作者：
R. Machida;T. Nakazawa;Y. Sakuraba;M. Fujiwara and N. Furuta
通过液体中激光烧蚀（LAL）采样的颗粒可以在酸消化或浆料雾化后通过电感耦合等离子体质谱（ICPMS）进行分析。LAL采样过程简单，标准溶液可用于校准。在这项研究中，我们调查元素分馏在LAL使用标准玻璃参考材料，NIST 610。将NIST 610置于顶部开口的室中，加入超纯水，直至玻璃表面低于水面3mm。以线扫描模式进行LAL采样。通过聚碳酸酯过滤器过滤，将LAL采样微粒分为两个尺寸类别：在过滤器上收集大于0.4 μm的微粒，将小于0.4 μm的微粒送入滤液中。用酸消化两种尺寸的颗粒，并通过ICPMS进行分析。挥发性元素在小颗粒中富集，在大颗粒中贫化。也就是说，在LAL采样过程中观察到与烧蚀颗粒尺寸相关的元素分馏。当LAL采样的颗粒被引入ICP中时，大颗粒没有完全分解。较大颗粒中的挥发性元素比钙更容易蒸发。因此，当通过浆液雾化ICPMS分析LAL采样颗粒时，观察到正元素分馏。浆料雾化和酸消化之间的比较显示，ICP中的粒度相关的元素分馏大于LAL采样期间观察到的。
Particles sampled by means of laser ablation in liquid (LAL) can be analyzed by inductively coupled plasma mass spectrometry (ICPMS) after acid digestion or slurry nebulization. The LAL sampling process is simple, and a standard solution can be used for calibration. In this study, we investigated elemental fractionation during LAL by using a standard glass reference material, NIST 610. NIST 610 was placed in an open-top chamber, and ultrapure water was added until the surface of the glass was 3 mm below the water surface. LAL sampling was carried out in line-scanning mode. The LAL-sampled particles were divided into two size classes by filtration through a polycarbonate filter: particles larger than 0.4 μm were collected on the filter, and particles smaller than 0.4 μm passed into the filtrate. Both sizes of particles were digested with acid and analyzed by ICPMS. Volatile elements were enriched in the smaller particles and depleted in the larger particles. That is, elemental fractionation related to the size of the ablated particles was observed during the LAL-sampling process. When the LAL-sampled particles were introduced into the ICP, the large particles did not decompose completely. Volatile elements in the larger particles were vaporized more easily than calcium. Therefore, positive elemental fractionation was observed when the LAL-sampled particles were analyzed by slurry nebulization ICPMS. Comparison between slurry nebulization and acid digestion revealed that particle size-related elemental fractionation in the ICP was larger than that observed during LAL sampling.