Quantitative Analysis of Boric Acid(B(OH)3)in Aqueous Salt Solution by Simplified Raman Integrating Sphere
Study on borate species and their distributions in aqueous solution are of great importance for the borate structure and thermodynamic non-equilibrium in aqueous solution and also borate deposits in salt lake,which has drew more and more attention to recent researchers.Aiming at improving the weak signal and low sensitivity of Raman characterization for borate species in aqueous solution,which is beneficial to analyze the interaction among borate anions in the quantitative perspective.This study has investigated the boric acid quantity in aqueous salt solution by using simplified Raman integrating sphere.The interaction ef-fects of coexisting salts of NaCl,MgCl2,KC1 and MgSO4 on Raman quantitative analysis of boric acid have been studied and the regression equation of boric acid has also been proposed.The results showed that the simplified Raman integrating sphere can significantly increase the Raman spectrum intensity of boric acid in aqueous solution.The corresponding limit of detection is about 70 times much higher than the con-ventional Raman spectroscopy.The correlation coefficients is more than 0.999 1 in the range of 0～6 g·L-1 of boric acid.And the relative error of measurement is about-2.5％.In the salt solution system of NaCl-MgCl2-KCl-MgSO4,The absolute value of relative error is less than 3％after corrected by the regression equation,which can be applied in the low content measurement of boric acid.The results of this paper could provide fundamental information and theoretical guidance for the future exploration of the quantita-tive analysis of the borate speciation in the brine.
Simplified Raman integrating sphereQuantitative analysisBoric acidAqueous salt solution
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