Optoelectronics Letters, Volume. 20, Issue 1, 42(2024)

Analysis on influencing factors of detecting chemical oxygen demand in water by three-dimensional spec-troscopy

Kunpeng ZHOU1, Zhiyang LIU2、*, Menglong CONG1, and Shanxin and MAN3
Author Affiliations
  • 1Inner Mongolia Autonomous Region Joint Laboratory of Nuclear and Radiation Detection, College of Physics and Electronic Information, Inner Mongolia Minzu University, Tongliao 028000, China
  • 2College of Information Engineering, Jingzhou University, Jingzhou 434000, China
  • 3Alxa League Meteorological Bureau, Alxa 750300, China
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    This paper focuses on the standard chemical oxygen demand (COD) liquid and studies the impact of pH, nitrite nitro-gen, nitrate nitrogen, heavy metals, salinity, and other factors on fluorescence intensity and fluorescence peak posi-tions during the detection of COD in water using fluorescence spectrometry. The influence mechanisms of different environmental factors on fluorescence spectra are also analyzed. Results indicate that pH value affects the fluorescence emission wavelength (Em), resulting in a red shift from 1.5 to 7.2, and a blue shift from 7.2 to 12.3. Nitrate nitrogen can react with organic matter in water to form nitro compounds, leading to a decrease in fluorescence intensity. Salin-ity has a negligible effect on T1 peak but a relatively large effect on T2 peak. Heavy metal ion concentration has a sig-nificant impact on T2 peak, while T1 peak position shifts with an increase in heavy metal ions. This study aims to ex-plore the factors that can impact the detection of COD in water using three-dimensional fluorescence spectrometry, providing references to improve accuracy and practicability for COD detection based on three-dimensional fluores-cence spectrometry.


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    ZHOU Kunpeng, LIU Zhiyang, CONG Menglong, and MAN Shanxin. Analysis on influencing factors of detecting chemical oxygen demand in water by three-dimensional spec-troscopy[J]. Optoelectronics Letters, 2024, 20(1): 42

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    Paper Information

    Received: May. 6, 2023

    Accepted: Jun. 30, 2023

    Published Online: May. 15, 2024

    The Author Email: Zhiyang LIU (zhiyangliu@dingtalk.com)