The development of chemical oxygen demand monitoring technology and instrument in seawater based on spectrum analysis

Zong-Qi Cai; Wei-Wei Feng; Yao-Bin Hou

doi:10.1117/12.2538881

20 November 2019 The development of chemical oxygen demand monitoring technology and instrument in seawater based on spectrum analysis

Zong-Qi Cai, Wei-Wei Feng, Yao-Bin Hou

Author Affiliations +

Proceedings Volume 11191, Advanced Sensor Systems and Applications IX; 1119117 (2019) https://doi.org/10.1117/12.2538881
Event: SPIE/COS Photonics Asia, 2019, Hangzhou, China

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.

Citation Download Citation

Zong-Qi Cai, Wei-Wei Feng, and Yao-Bin Hou "The development of chemical oxygen demand monitoring technology and instrument in seawater based on spectrum analysis", Proc. SPIE 11191, Advanced Sensor Systems and Applications IX, 1119117 (20 November 2019); https://doi.org/10.1117/12.2538881

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