Quantitative Determination of Sulfate in Hydrate and Water Systems by Raman Spectrometry

DENG Xing-bo; CHEN Min; LIU Chang-ling; REN Hong-bo; ZHUANG Xin-guo

2014 Vol. 33, No. 3

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DENG Xing-bo, CHEN Min, LIU Chang-ling, REN Hong-bo, ZHUANG Xin-guo. Quantitative Determination of Sulfate in Hydrate and Water Systems by Raman Spectrometry[J]. Rock and Mineral Analysis, 2014, 33(3): 418-423.

Citation:

DENG Xing-bo, CHEN Min, LIU Chang-ling, REN Hong-bo, ZHUANG Xin-guo. Quantitative Determination of Sulfate in Hydrate and Water Systems by Raman Spectrometry[J]. Rock and Mineral Analysis, 2014, 33(3): 418-423.

Quantitative Determination of Sulfate in Hydrate and Water Systems by Raman Spectrometry

1.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China
3.
The Key Laboratory of Gas Hydrate, Ministry of Land and Resources, Qingdao 266071, China

More Information

Corresponding author: CHEN Min, catherine9960@163.com

Received Date: 11 January 2013

Accepted Date: 17 January 2014

Publish Date: 25 March 2014

Abstract

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. 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.
- nature gas hydrate /
- sulfate /
- Raman spectrometry /
- on-line quantitative determination

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