Line Scanning Quantitative Analysis by Laser Ablation Inductively Coupled Plasma Mass Spectrometry with Small Laser Beam
10.11895/j.issn.0253-3820.181066
- VernacularTitle:激光剥蚀电感耦合等离子体质谱小激光斑束线扫描定量分析技术
- Author:
Ling-Hao ZHAO
1
;
Dong-Yang SUN
;
Ming-Yue HU
;
Xiu-Chun ZHAN
;
Ling-Sen ZENG
Author Information
1. 国家地质实验测试中心
- Keywords:
Laser ablation inductively coupled plasma mass spectrometry;
Line scanning quantitative analysis;
Elemental fractionation;
Titanite
- From:
Chinese Journal of Analytical Chemistry
2018;46(6):931-937
- CountryChina
- Language:Chinese
-
Abstract:
Line scanning quantitative analysis method on silicate with small laser beam ( < 15 μm) was developed using laser ablation sector field inductively coupled plasma mass spectrometry (LA-SF-ICP-MS). Differences on signal intensity and elemental fractionation induced by different laser sampling patterns were compared. While spot ablation with small laser beam, the elemental signal intensity decreased with time significantly, and the elemental fractionation was obvious. In contrast, the elemental signal intensity by line scanning was higher and more stable and line scanning was free of elemental fractionation. Therefore, identical ablation pattern and condition should be used for the standard and the unknown sample in LA-ICP-MS quantitative analysis. A single pulse experiment was carried out to investigate the washout time when coupled to two-volume ablation cell. The result indicated that the elemental intensity decayed to the background value needed 2-3 s. The optimal parameters on SF-ICP-MS were set to reduce the effect of signal overlapping. Homogeneous sample KL2-G and titanite grains with composition zoning were analyzed by this method. Accurate element contents and element ratios indicated that fast washout time and optimal instrument parameters made it feasible to perform line scanning quantitative analysis accurately. Comparing to traditional microanalysis, line scanning quantitative analysis could reduce the laser beam size (<15 μm) and improve the spatial resolution efficiently. The potential of the technique to unveil compositional complexities in greater detail would help to improve our understanding of geochemical processes in mineral scale.
