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Proceedings Paper

The development of chemical oxygen demand monitoring technology and instrument in seawater based on spectrum analysis
Author(s): Zong-Qi Cai; Wei-Wei Feng; Yao-Bin Hou
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Paper Abstract

In order to achieve rapid detection of chemical oxygen demand (COD) in seawater, in-situ monitoring technology and instrument for seawater COD based on spectrum analysis were studied. The influence of chloride ion (Cl-), bromine ion (Br-) and turbidity on COD measurement was studied using quantitative method. The results show that the absorption peak of Cl- and Br- is mainly between 190nm and 225nm. The absorption spectral intensity almost unchanged adding Cl- and Br- with different concentrations. The influence of Cl- and Br- on ecological parameters measurement was fixed. The absorbance at 300-720nm is caused by turbidity. Turbidity compensation can be carried out by the absorbance at 300-720nm, the effect of turbidity is eliminated on COD calculation. An absorption spectrum model based on least square method was established using artificial seawater in the laboratory. The model was validated using blind samples, and comparison was done between model calculation and actual value.

Paper Details

Date Published: 20 November 2019
PDF: 7 pages
Proc. SPIE 11191, Advanced Sensor Systems and Applications IX, 1119117 (20 November 2019); doi: 10.1117/12.2538881
Show Author Affiliations
Zong-Qi Cai, Yantai Institute of Coastal Zone Research (China)
Wei-Wei Feng, Yantai Institute of Coastal Zone Research (China)
Univ. of Chinese Academy of Sciences (China)
Yao-Bin Hou, Yantai Institute of Coastal Zone Research (China)

Published in SPIE Proceedings Vol. 11191:
Advanced Sensor Systems and Applications IX
Tiegen Liu; Gang-Ding Peng; Zuyuan He, Editor(s)

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