基于氧敏感膜的海水溶解氧测定技术研究

doi:10.3976/j.issn.1002-4026.2019.05.003

Shandong Science ›› 2019, Vol. 32 ›› Issue (5): 31-37.doi: 10.3976/j.issn.1002-4026.2019.05.003

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A dissolved oxygen detection technique based on an oxygen sensitive membrane in seawater

WU Bing-wei, ZHANG Ying-ying, ZHANG Yun-yan, FENG Xian-dong, YUAN Da

Shandong Provincial Key Laboratory of Marine Monitoring Technology, National Engineering and Technological Research Center of Marine Monitoring Equipment, Institute of Oceanographic Instrumentation, Qilu University of Technology (Shandong Academy of Sciences)，Qingdao 266100，China

Received:2019-04-24 Online:2019-10-20 Published:2019-10-08

Abstract

Abstract: A fluorescence quenching method for detecting dissolved oxygen in seawater was proposed. A design scheme of fluorescence detection system based on an oxygen sensitive membrane in seawater was introduced in detail from the aspects of photoelectric detection circuit, LED drive circuit, photodiode circuit, temperature detection circuit, signal generation acquisition, and control circuit, etc. The fluorescence detection system was tested for measurement accuracy in phase lag detection, systematic stability, and system test data. In the data accuracy test, the dissolved oxygen saturation was found to have reduced from 100.00% to 11.56%. The error between the measurements obtained by the fluorescence detection system based on an oxygen sensitive membrane and iodimetry was 5.15 μmol/L, and the two methods showed the same trend. This system could be used as a seawater-dissolved oxygen-measuring instrument with good application value.

Key words: photoelectric detection, fluorescence quenching, iodimetry, phase sensitive detection, dissolved oxygen

CLC Number:

TH89

WU Bing-wei, ZHANG Ying-ying, ZHANG Yun-yan, FENG Xian-dong, YUAN Da. A dissolved oxygen detection technique based on an oxygen sensitive membrane in seawater[J].Shandong Science, 2019, 32(5): 31-37.

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A dissolved oxygen detection technique based on an oxygen sensitive membrane in seawater

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