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- Title
碱熔-标准物质法-电感耦合等离子体原子发射光谱 (ICP-AES) 法测定硅酸盐岩中 10 种主量元素.
- Authors
李佳; 谢小敏; 刘俊玲; 高婧; 黄文静; 张雷
- Abstract
The accurate determination of elements in silicate rocks is the foundation of their geochemical analysis research. The concentration of major elements can usually be determined by inductively coupled plasma atomic emission spectroscopy(ICP-AES), but the systematic research on this method is relatively lacking, especially in the aspects of sample pretreatment and effective elimination of matrix interference. During the pre-treatment process, the decomposition ability of silicate rock samples under different weights of flux was tested. It was found that when the ratio of flux to sample reached 6∶1, the molten beads were clean and transparent. After being extracted with dilute nitric acid, the solution were completely clear. The optimal ratio of flux to sample was determined for silicate rock pre-treatment. During the determination process, two matrix interference elimination methods, i. e. matrix matching method and standard substance method, were conducted to determine their impact on the measurement results. It was demonstrated that when using standard substances that were identical or close to the lithology, the calibration work curve performed better elimination effect and thus this method was more suitable for measuring the content of 10 main elements in silicate rocks. Building upon these findings, a method was established for simultaneous determination of 10 elements in silicate rocks which was decomposed by alkali fusion and determined by ICP-AES, including SiO2, Fe2O3, Al2O3, CaO, K2O, MgO, Na2O, TiO2, P2O5, and MnO. Though determining the rock standard substance GBW07107, the relative standard deviation(RSD) of this method was 0. 17%-0. 75%, and the detection limit of the method was 0. 001%-0. 016%, which met the requirements for quantitative analysis of elements in silicate rock samples. This method was simple and fast, with low environmental pollution, and is suitable for the analysis of large numbers of samples.
- Publication
Chinese Journal of Inorganic Analytical Chemistry / Zhongguo Wuji Fenxi Huaxue, 2024, Vol 14, Issue 3, p292
- ISSN
2095-1035
- Publication type
Article
- DOI
10.3969/j.issn.2095-1035.2024.03.006