[The Quantitative Analysis of Raman Spectroscopy to Sulfate Ion in Aqueous Solution].
[The Quantitative Analysis of Raman Spectroscopy to Sulfate Ion in Aqueous Solution].
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发表时间：
2016-02
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通讯作者：
Qian-qian Wang;Qiang Sun
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作者：
Qian-qian Wang;Qiang Sun
拉曼光谱技术作为一种非破坏性、非接触性的检测方法，在许多研究领域得到了广泛的应用。基于振动波数，拉曼光谱通常用于确定分子种类。因此，拉曼定量分析是必要的。本研究通过对拉曼强度的理论分析，认为拉曼定量测量应采用相对强度比值法，分为内标法和外标法。这消除了测量条件的影响。对于水溶液，将水的OH伸缩谱带作为内标来测定水溶液中溶质的浓度是合理的。本文记录了Na ~+ SO_4 ~--H_2 O、K ~+ SO_4 ~--H_2 O和NaCl-Na ~+ SO_4 ~--H_2 O的拉曼光谱。此外，水分子的拉曼OH伸缩谱带可以拟合为两个高斯子带。用强度比I（SO_（2-））/I（W）来确定水溶液中硫酸根的摩尔浓度，其中I（SO_（2-））表示硫酸根谱带的强度，I（W）表示水的拉曼OH伸缩谱带的两个子谱带之和。因此，可以利用拉曼光谱来测量水溶液中的SO_2 ~（2-）浓度。
As a non-destructive and non-contact method, Raman spectroscopy has been widely applied in many research fields. Based on vibrational wavenumber, Raman spectroscopy is usually applied to determine the molecular species. Therefore, Raman quantitative analysis is necessary. In this study, according to the theoretical analysis of Raman intensity, Raman quantitative measurement should be fulfilled by relative intensity ratio, which can be divided into internal and external standards. This eliminates the influence of the measurement conditions. For aqueous solution, it is reasonable to treat the OH stretching band of water as an internal standard to determine the solute concentrations in aqueous solution. The Raman spectra of Na₂SO₄-H₂O, K₂SO₄-H₂O and NaCl-Na₂SO₄-H₂O are recorded in the paper. In addition, the Raman OH stretching band of water can be fitted into two Gaussian sub-bands. The intensity proportion I(SO₄²⁻)/I(W) is used to determine the molarity of sulfate in aqueous solution, where I(SO₄²⁻) represents the intensity of sulfate band and I(W) represents the sum of the two sub-bands of Raman OH stretching bands of water. Therefore, Raman spectroscopy can be utilized to measure the SO₄²⁻concentrations in aqueous solutions.