The Application of Raman Shift of Sulfate in Temperature Detection of Deep-Sea Hydrothermal Fluid
XI Shi-chuan1, 3, ZHANG Xin1, 2, 3*，DU Zeng-feng1, LUAN Zhen-dong1, LI Lian-fu1, 3, WANG Bing1, LIANG Zheng-wei1, 3, LIAN Chao1, YAN Jun1
1. Key Laboratory of Marine Geology and Environment & Center of Deep Sea Research, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2. Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China
3. University of Chinese Academy of Sciences, Beijing 101048, China
Abstract：Hydrothermal field is a typical deep-sea extreme environment where there are various sulfide minerals and special ecological communities. The research on the physicochemical characters of hydrothermal fluid is essential to the understanding of hydrothermal activities. The laser Raman spectroscopy has been used both at the qualitative and quantitative analysis, especially the in situ detections in the deep sea. In this paper, we simulated the hydrothermal fluid environment characterized by high temperature and high pressure, and discussed the availability of the Raman shifts of water and sulfate for detecting the temperature of the deep-sea hydrothermal fluids. The experiment results showed that the Raman shifts of the ν1(H2O) and ν1(SO2-4) were sensitive to the temperature. However, the Raman shifts of the ν1（H2O） are also affected by the concentration of sulfate obviously, which is an obstacle to calculating the temperature of the hydrothermal fluid. On the contrary, the Raman shift of the ν1(SO2-4) is insensitive to the concentration of sulfate and fluid pressure, which makes it a good choice to calculate the temperature of the hydrothermal fluid. Therefore, we established the liner relationship equationof the ν1(SO2-4) Raman shift with temperature: Rν1(SO2-4)=-0.03T+980.69, R2=0.998 6, which is also suitable for the in situ measurements of the hydrothermal fluid in the deep sea.
Key words：Laser Raman spectroscopy; Hydrothermal fluid; Sulfate; Temperature
席世川，张 鑫，杜增丰，栾振东，李连福，王 冰，梁政委，连 超，阎 军. 硫酸根拉曼频移用于深海热液温度探测的方法探讨[J]. 光谱学与光谱分析, 2018, 38(11): 3390-3394.
XI Shi-chuan, ZHANG Xin，DU Zeng-feng, LUAN Zhen-dong, LI Lian-fu, WANG Bing, LIANG Zheng-wei, LIAN Chao, YAN Jun. The Application of Raman Shift of Sulfate in Temperature Detection of Deep-Sea Hydrothermal Fluid. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2018, 38(11): 3390-3394.
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