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In situ Raman quantitative detection of methane concentrations in deep‐sea high‐temperature hydrothermal vent fluids
Author(s) -
Li Lianfu,
Zhang Xin,
Luan Zhendong,
Du Zengfeng,
Xi Shichuan,
Wang Bing,
Cao Lei,
Lian Chao,
Yan Jun
Publication year - 2020
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.5981
Subject(s) - raman spectroscopy , hydrothermal circulation , methane , hydrothermal vent , deep sea , analytical chemistry (journal) , in situ , calibration , chemistry , mineralogy , materials science , geology , environmental chemistry , oceanography , optics , organic chemistry , physics , quantum mechanics , seismology
Raman spectroscopy is an ideal approach for measuring methane concentrations in deep‐sea high‐temperature hydrothermal vent fluids due to its advantages of being nondestructive and noninvasive and not requiring sample pretreatment. However, no application of Raman spectroscopy in the measurement of hydrothermal methane has yet been reported because of the lack of Raman quantitative calibration models for CH 4 suitable for hydrothermal fluid detection and available for deep‐sea in situ Raman experiments. In this study, a new Raman quantitative calibration model suitable for hydrothermal fluid detection was established with the linear equation A CH 4 / A H 2 O= (2.61E‐3 ± 8.52E‐6) × C CH 4 , where A CH 4 / A H 2 Ois the peak area ratio of CH 4 and H 2 O and C CH 4is the concentration of dissolved CH 4 in mmol/kg. In situ Raman spectra of deep‐sea hydrothermal fluids were acquired using an adapted deep‐sea in situ Raman spectrometer, Raman insertion probe (RiP) system, and then the methane concentrations were determined based on the quantitative calibration model for CH 4 . The concentrations of methane measured by RiP are approximately 1.5–4.0 times higher than those derived from the gas‐tight samples collected simultaneously at the same vents, which indicates that the amount of methane released from the hydrothermal system has probably been underestimated.