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- Title
Determination of Metasilicic Acid Content in Salt Lake Brine by Inductively Coupled Plasma Optical Emission Spectrometry with Cation Exchange Resin Separation.
- Authors
WANG Yang; ZHANG Lulu; WANG Murong; XU Hongyin; ZHANG Yanfang
- Abstract
Due to the different concentration and high salinity of salt in salt lake brine, it is difficult to determine accurately by conventional analysis methods. By investigating the addition amount of cation exchange resin, the exchange time of cation exchange resin, the influence of pH value on exchange efficiency, and the correction of internal standard elements, the determination of metasilicate in salt lake brine by cation exchange resin separation and inductively coupled plasma emission spectrometry was established. In this method, salt lake brine is diluted five times, 6 g cation exchange resin is added, and the static exchange is 1. 5 h. After removing a large number of cations in the brine, Si 251. 611 nm is selected as the analytical spectral line, and Y 371. 030 nm spectral line is used as the internal standard for signal drift correction. The content of metasilicic acid in the brine is determined by inductively coupled plasma emission spectrometer. The calibration curve is tested under the optimum conditions, and the linear range of the calibration curve is 0. 50--200 mg/L, and the linear relationship of the regression equation obtained is good (rj^ 0. 9994). The detection limit of this method is 0. 16 mg/L, the relative standard deviation (RSD, w = 12) is 1. 8%--4. 6%, and the recovery of standard addition is 96. 3%--102%. At the same time, UV-visible spectrophotometry is used to compare the content of metasilicic acid, and there is no significant difference between the two test results, indicating that the method has good accuracy. Through this method, the content of metasilicic acid in salt lake brine can be determined quickly and accurately, providing reliable data support for improving the comprehensive utilization of salt lake resources.
- Publication
Chinese Journal of Inorganic Analytical Chemistry / Zhongguo Wuji Fenxi Huaxue, 2023, Vol 13, Issue 8, p857
- ISSN
2095-1035
- Publication type
Academic Journal
- DOI
10.3969/j.issn.2095-1035.2023.08.011