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Turbidity compensation method based on Mie scattering theory for water chemical oxygen demand determination by UV-Vis spectrometry

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Abstract

In view of the problem that chemical oxygen demand (COD) measurement in water using UV-Vis spectrometry was easily affected by turbidity, this paper proposed an analytical method for determining the complex refractive index of particles in water based on Lambert-Beer’s law and K-K (Kramers-Kronig) relationship. The obtained complex refractive index was used to establish the turbidity compensation model in the COD characteristic spectral region, and the COD concentration inversion were achieved by using the PLS algorithm. The results show that the turbidity compensation method based on Mie scattering theory can improve the accuracy of COD measurement by UV-Vis spectroscopy. Compared with before turbidity compensation, R2 (determination coefficient) between true values and predicted values of COD increased from 0.2274 to 0.9629, and RMSE (root mean square error) of predicted values decreased from 21.73 to 3.12 mg L−1. Compared with 350 nm PC, derivative method, and improved MSC method, the turbidity compensation method for COD measurement based on Mie scattering theory is simple, fast, and highly accurate. And the calculated spectrum can represent the scattering characteristics of the measured spectrum. The average relative error between the fitted spectrum and the original normalized spectrum in the 55 mixed solutions was 0.52%, and the maximum relative error was 6.65%. This method can be useful for online COD measurement.

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Funding

This work is financially supported by National Key Research and Development Plan (2016YFC1400600, 2017YFF0108402), Natural Science Foundation of Anhui Province (1808085MF208), Scientific Instruments and Equipments Development Project of Chinese Academy of Sciences (YJKYYQ20190050), and Natural Science Foundation of China (61805255, 61378041).

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Authors and Affiliations

  1. Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, 350 Shushanhu Road, Hefei, 230031, Anhui, China

    Xiaowei Chen, Gaofang Yin, Nanjing Zhao, Ruifang Yang, Meng Xia, Chun Feng, Yunan Chen, Ming Dong & Wei Zhu

  2. University of Science and Technology of China, Hefei, 230026, Anhui, China

    Xiaowei Chen, Meng Xia, Chun Feng, Yunan Chen, Ming Dong & Wei Zhu

  3. Institutes of Physical Science and Information Technology, Anhui University, Hefei, 230601, Anhui, China

    Nanjing Zhao

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  1. Xiaowei Chen
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  2. Gaofang Yin
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  3. Nanjing Zhao
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  4. Ruifang Yang
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  5. Meng Xia
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  7. Yunan Chen
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  8. Ming Dong
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  9. Wei Zhu
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All authors contributed to the study conception and design. All authors read and approved the final manuscript.

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Correspondence to Gaofang Yin or Nanjing Zhao.

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Chen, X., Yin, G., Zhao, N. et al. Turbidity compensation method based on Mie scattering theory for water chemical oxygen demand determination by UV-Vis spectrometry. Anal Bioanal Chem 413, 877–883 (2021). https://doi.org/10.1007/s00216-020-03042-4

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  • DOI: https://doi.org/10.1007/s00216-020-03042-4

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