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Sensors 2017, 17(12), 2784; https://doi.org/10.3390/s17122784

A Direct Bicarbonate Detection Method Based on a Near-Concentric Cavity-Enhanced Raman Spectroscopy System

College of Information Science & Engineering, Ocean University of China, Qingdao 266000, China
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Received: 18 October 2017 / Revised: 25 November 2017 / Accepted: 29 November 2017 / Published: 1 December 2017
(This article belongs to the Special Issue Smart Sensing System for Real-Time Monitoring)
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Abstract

Raman spectroscopy has great potential as a tool in a variety of hydrothermal science applications. However, its low sensitivity has limited its use in common sea areas. In this paper, we develop a near-concentric cavity-enhanced Raman spectroscopy system to directly detect bicarbonate in seawater for the first time. With the aid of this near-concentric cavity-enhanced Raman spectroscopy system, a significant enhancement in HCO3 detection has been achieved. The obtained limit of detection (LOD) is determined to be 0.37 mmol/L—much lower than the typical concentration of HCO3 in seawater. By introducing a specially developed data processing scheme, the weak HCO3 signal is extracted from the strong sulfate signal background, hence a quantitative analysis with R2 of 0.951 is made possible. Based on the spectra taken from deep sea seawater sampling, the concentration of HCO3 has been determined to be 1.91 mmol/L, with a relative error of 2.1% from the reported value (1.95 mmol/L) of seawater in the ocean. It is expected that the near-concentric cavity-enhanced Raman spectroscopy system could be developed and used for in-situ ocean observation in the near future. View Full-Text
Keywords: laser Raman spectroscopy; bicarbonate; direct detection; ocean application laser Raman spectroscopy; bicarbonate; direct detection; ocean application
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Yang, D.; Guo, J.; Liu, C.; Liu, Q.; Zheng, R. A Direct Bicarbonate Detection Method Based on a Near-Concentric Cavity-Enhanced Raman Spectroscopy System. Sensors 2017, 17, 2784.

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