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Cite this paper: |
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DU Zengfeng, LI Ying, CHEN Jing, GUO Jinjia, ZHENG Rong'er. Feasibility investigation on deep ocean compact autonomous Raman spectrometer developed for in-situ detection of acid radicalions[J]. Journal of Oceanology and Limnology, 2015, 33(2): 545-550 |
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Feasibility investigation on deep ocean compact autonomous Raman spectrometer developed for in-situ detection of acid radicalions |
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| DU Zengfeng, LI Ying, CHEN Jing, GUO Jinjia, ZHENG Rong'er |
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| Optics and Optoelectronics Laboratory, Ocean University of China, Qingdao 266100, China |
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| Abstract: |
| A newly developed Deep Ocean Compact Autonomous Raman Spectrometer (DOCARS) system is introduced and used for in-situ detection of acid radicalions in this paper. To evaluate the feasibility and capability of DOCARS for quantitative analysis of the acid radicalions in the deep ocean, extensive investigations have been carried out both in laboratory and sea trials during the development phase. In the laboratory investigations, Raman spectra of the prepared samples (acid radicalions solutions) were obtained, and analyzed using the method of internal standard normalization in data processing. The Raman signal of acid radicalions was normalized by that of water molecules. The calibration curve showed that the normalized Raman signal intensity of SO42-, NO3-, and HCO3- increases linearly as the concentration rises with correlation coeffi cient R2 of 0.99, 0.99, and 0.98 respectively. The linear function obtained from the calibration curve was then used for the analysis of the spectra data acquired in the sea trial under a simulating chemical field in the deep-sea environment. It was found that the detected concentration of NO3- according to the linear function can refl ect the concentration changes of NO3- after the sample was released, and the detection accuracy of the DOCARS system for SO42- is 8%. All the results showed that the DOCARS system has great potential in quantitative detection of acid radicalions under the deep-sea environment, while the sensitivity of the DOCARS system is expected to be improved. |
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| Key words:
laser Raman spectroscopy|Deep Ocean Compact Autonomous Raman Spectrometer (DOCARS)|acid radicalions
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| Received: 2014-04-11 Revised: 2014-05-14 |
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