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

doi:10.3964/j.issn.1000-0593(2015)04-0924-05

CORC > 北京大学 > 地球与空间科学学院

	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; Raman Spectroscopic Study on the Determination of SO42- Concentration in Aqueous Solution under High Temperature and Pressure
	田锋 ; 郑海飞 ; 孙樯
刊名	光谱学与光谱分析
	2015
关键词	金刚石压腔拉曼光谱高温高压定量 Diamond-anvil cell Raman spectroscopy High temperature and high pressure Quantitative DISSOLUTION
DOI	10.3964/j.issn.1000-0593(2015)04-0924-05
英文摘要	当前,拉曼光谱通常被应用于定性研究,拉曼光谱的定量研究明显不足。通过理论分析,拉曼光谱的定量研究应当基于其相对强度来进行。据此,通过对三种不同浓度的Na_2SO_4溶液进行拉曼光谱分析,得到了常温常压下水溶液中SO~(2-)_4离子浓度的定量方程为:c(SO~(2-)_4)=4.779 6R(r~2=0.999 4)。此外,对高温高压下硫酸根水溶液的拉曼光谱也进行了研究。光谱分析表明,温度和压力将影响拉曼谱峰强度比值与SO~(2-)_4浓度的关系。高温高压下水溶液中SO~(2-)_4浓度的定量方程为:c(SO~(2-)_4)=4.779 6(R+1.469×10~(-4)Δ_T+1.340×10~(-4)Δ_P),式中c(SO~(2-)_4)为待测溶液中SO~(2-)_4的浓度,R为拉曼谱峰强度的比值R(SO~(2-)_4/H_2O),Δ_T为相对于常温(23 ℃)时的温度差,Δ_P为相对于常压(0.1 MPa)时的压力差。该方程适用的温度范围为23 ℃≤T≤360 ℃,浓度范围为0.5~1.5 mol·L~(-1),测量的相对误差为6.5%。对于具有拉曼活性的物质,拉曼光谱实验技术可以用来进行水溶液中物质浓度的定量研究。; 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 SO42- concentration. The SO42- concentration in aqueous solution at ambient temperature and pressure can be determined by the Raman intensity according to the linear fitting equation c(SO42-)=4.779 6R(r(2)=0.9994). Furthermore, the research proves that the temperature and pressure will affect the relationship between the Raman intensity ratio and the concentration of SO42- ions. The quantitative equation for measuring the SO42- concentration in aqueous solution at high temperature and high pressure is c(SO42-)=4.779 6 (R+1.469 x 10(-4) Delta(T)+1.340x 10(-4)Delta(P)), where R is defined as the ratio of the SO42- ions band intensity to the OH stretching single band intensity, Delta(T) is the temperature relative to 23 degrees C, Delta(P) is the pressure relative to 0.1 MPa, 23 degrees C <= T <= 390 degrees C, the concentration range of the SO2-4 ions is 0.5 similar to 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.; 国家自然科学基金项目,国家(973)项目; SCI(E); EI; 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); fengtian@pku.edu.cn; hfzheng@pku.edu.cn; 4; 924-928; 35
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/415396]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	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, Raman Spectroscopic Study on the Determination of SO42- Concentration in Aqueous Solution under High Temperature and Pressure[J]. 光谱学与光谱分析,2015.
APA	田锋,郑海飞,&孙樯.(2015).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.光谱学与光谱分析.
MLA	田锋,et al."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".光谱学与光谱分析 (2015).