Abstract：In the present work, the Raman spectra of SO2-4 ions in aqueous solutions were studied. The quantitative analysis shows that there is a significant correlation between the Raman intensity ratio(R) and the SO2-4 concentration. The SO2-4 concentration in aqueous solution at ambient temperature and pressure can be determined by the Raman intensity according to the linear fitting equation ｃ(SO2-4)=4.779 6R(r2=0.999 4). Furthermore, the research proves that the temperature and pressure will affect the relationship between the Raman intensity ratio and the concentration of SO2-4 ions. The quantitative equation for measuring the SO2-4 concentration in aqueous solution at high temperature and high pressure is ｃ(SO2-4)=4.779 6(R+1.469×10-4ΔT+1.340×10-4ΔP), where R is defined as the ratio of the SO2-4 ions band intensity to the OH stretching single band intensity, ΔT is the temperature relative to 23 ℃, ΔP is the pressure relative to 0.1 MPa, 23 ℃≤T≤390 ℃, the concentration range of the SO2-4 ions is 0.5～1.5 mol·L-1, and the uncertainty of the equation is 6.5%. Raman spectroscopy can be used to measure the concentration of the Raman-active species in aqueous solutions.
Key words：Diamond-anvil cell;Raman spectroscopy;High temperature and high pressure;Quantitative
田 锋，郑海飞*，孙 樯 . 高温高压下水溶液中硫酸根离子浓度的拉曼光谱定量测定研究 [J]. 光谱学与光谱分析, 2015, 35(04): 924-928.
TIAN Feng, ZHENG Hai-fei*, SUN Qiang . Raman Spectroscopic Study on the Determination of SO2-4 Concentration in Aqueous Solution under High Temperature and Pressure . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2015, 35(04): 924-928.
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