岩矿测试Issue(3)：413-418,6.
拉曼光谱法定量测定水合物-水体系中的硫酸根
Quantitative Determination of Sulfate in Hydrate and Water Systems by Raman Spectrometry
摘要
Abstract
Sulfate content is one of the important parameters in pore water of gas hydrate. The relationship between sulfate and gas hydrate has become an important method to study geochemical anomalies of gas hydrate. It is particularly important to establish a fast and real time method in order to determine and therefore understand the cause and mechanism of sulphate concentration anomalies. An explanation of a uniquely designed synthetic experiment for gas hydrate is described in this paper,which is a method for the quantitative determination of sulfate in seawater using Raman Spectrometry at high pressure and low temperature. The relationship between the sulfate content and its Raman spectrum parameters was in a good linear agreement within 2. 0-70. 0 g/L. The equation of linear regression is R=0 . 0013ρ-0 . 000066 . The related coefficient is r=0 . 9998 . The detection limit is 0 . 2 g/L (about 238 μg/mL). The recoveries are 102. 1% -123. 8% with precision of 2. 5% -3. 4%(RSD,n=12). The test result shows that the changes of sulfate content in gas hydrate and water system on-line by Raman spectroscopy can be detected. Compared to ion chromatography,the original samples remain intact with this method,and it is convenient and rapid. By preliminary analysis of the changes of sulfate content,it was founded that sulfate content basically presented ladder form rise and determined that the formation of gas hydrate was a repeated process of gas dissolution,nucleation and growth until the entire reaction system reaches equilibrium.关键词
天然气水合物/硫酸根/拉曼光谱法/在线定量测试Key words
nature gas hydrate/sulfate/Raman Spectrometry/on-line quantitative determination分类
能源科技引用本文复制引用
邓兴波,陈敏,刘昌岭,任宏波,庄新国..拉曼光谱法定量测定水合物-水体系中的硫酸根[J].岩矿测试,2014,(3):413-418,6.基金项目
国土资源部公益性行业科研专项 （）
