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Determination of Chemical Oxygen Demand in Water Samples Using Gas-phase Molecular Absorption Spectrometry

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Abstract

Chemical oxygen demand (COD) is important for water quality assessment as it represents the level of reductive organic pollution from eutrophication in aquatic systems. For surface water quality monitoring, permanganate is usually applied as an oxidizing reagent, and the routine CODMn determination is mostly achieved by titration method. However, this titration method is tedious and time consuming, and the results suffer from environmental temperature fluctuations and complicated operation techniques. In this study, a novel CODMn determination method was developed using gas-phase molecular absorption spectrometry equipped with an online automated digestion device for the first time. The effects of digestion temperature, digestion time and sulfuric acid content were thoroughly studied. This method exhibited good linearity (0.35 to 12 mg/L), a low detection limit (0.12 mg/L), and good RSD from various water samples (0.71 - 2.37%). When used for CODMn determination in routine water quality monitoring, this automated GPMAS can considerably improve analysis speed, efficiency, accuracy and stability compared to the traditional titration method.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (No. 51909012).

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Authors and Affiliations

  1. Bureau of Hydrology, Changjiang Water Resources Commission, Wuhan, 430010, China

    Xiaomin Chen, Lian Peng, Jingcheng Wang, Debing Zhang & Qichao Zhao

  2. Shanghai Beiyu Analytical Instrument Co., Ltd., Shanghai, 200431, China

    Yong Zhao

  3. Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy, School of Materials and Energy, Southwest University, Chongqing, 400715, China

    Tianhao Li

Authors
  1. Xiaomin Chen
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  2. Lian Peng
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  3. Jingcheng Wang
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  4. Debing Zhang
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  5. Yong Zhao
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  6. Qichao Zhao
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  7. Tianhao Li
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Correspondence to Tianhao Li.

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Chen, X., Peng, L., Wang, J. et al. Determination of Chemical Oxygen Demand in Water Samples Using Gas-phase Molecular Absorption Spectrometry. ANAL. SCI. 36, 841–846 (2020). https://doi.org/10.2116/analsci.19P444

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  • DOI: https://doi.org/10.2116/analsci.19P444

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