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In situ Raman quantitative detection of methane concentrations in deep‐sea high‐temperature hydrothermal vent fluids
Journal of Raman Spectroscopy ( IF 2.5 ) Pub Date : 2020-09-02 , DOI: 10.1002/jrs.5981 Lianfu Li 1, 2, 3 , Xin Zhang 1, 2, 3, 4 , Zhendong Luan 1, 2 , Zengfeng Du 1 , Shichuan Xi 1, 3 , Bing Wang 1, 3 , Lei Cao 1 , Chao Lian 1 , Jun Yan 1
Journal of Raman Spectroscopy ( IF 2.5 ) Pub Date : 2020-09-02 , DOI: 10.1002/jrs.5981 Lianfu Li 1, 2, 3 , Xin Zhang 1, 2, 3, 4 , Zhendong Luan 1, 2 , Zengfeng Du 1 , Shichuan Xi 1, 3 , Bing Wang 1, 3 , Lei Cao 1 , Chao Lian 1 , Jun Yan 1
Affiliation
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 CH4 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 = (2.61E‐3 ± 8.52E‐6) × , where is the peak area ratio of CH4 and H2O and is the concentration of dissolved CH4 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 CH4. 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.
中文翻译:
原位拉曼定量检测深海高温热液排放液中甲烷浓度
拉曼光谱法具有无损,无创且无需样品预处理的优点,是测量深海高温热液排放液中甲烷浓度的理想方法。但是,由于缺乏适用于水热流体检测且可用于深海原位拉曼实验的CH 4的拉曼定量校准模型,因此尚未报道将拉曼光谱法应用于热液甲烷的测量。在这项研究中,建立了适用于热液流体检测的新拉曼定量校准模型,其线性方程=(2.61E-3±8.52E-6)× ,其中CH 4和H 2 O的峰面积比为是溶解的CH 4的浓度,单位为mmol / kg。使用适应性深海原位拉曼光谱仪,拉曼插入探针(RiP)系统获取深海热液的原位拉曼光谱,然后根据CH 4定量校准模型确定甲烷浓度。通过RiP测量的甲烷浓度大约是在相同排气口同时收集的气密性样品中甲烷浓度的1.5-4.0倍,这表明从水热系统释放的甲烷量可能被低估了。
更新日期:2020-09-02
中文翻译:
原位拉曼定量检测深海高温热液排放液中甲烷浓度
拉曼光谱法具有无损,无创且无需样品预处理的优点,是测量深海高温热液排放液中甲烷浓度的理想方法。但是,由于缺乏适用于水热流体检测且可用于深海原位拉曼实验的CH 4的拉曼定量校准模型,因此尚未报道将拉曼光谱法应用于热液甲烷的测量。在这项研究中,建立了适用于热液流体检测的新拉曼定量校准模型,其线性方程=(2.61E-3±8.52E-6)× ,其中CH 4和H 2 O的峰面积比为是溶解的CH 4的浓度,单位为mmol / kg。使用适应性深海原位拉曼光谱仪,拉曼插入探针(RiP)系统获取深海热液的原位拉曼光谱,然后根据CH 4定量校准模型确定甲烷浓度。通过RiP测量的甲烷浓度大约是在相同排气口同时收集的气密性样品中甲烷浓度的1.5-4.0倍,这表明从水热系统释放的甲烷量可能被低估了。