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Determination of Chemical Oxygen Demand Using UV/O3

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Abstract

In this paper, we report on the development of a simple, fast, and environment-friendly UV/O3-based method as an improved alternative to the conventional chemical methods using dichromate or permanganate for determining chemical oxygen demand (COD) in water. In the method through the continuous monitoring of O3 and CO2 (concentration and flow rate) before and after reaction, COD can be accurately determined. During the experiment, sample solutions with known COD concentration of 25, 12.5, 5, 2.5, and 1 ppm were first used to validate the feasibility of this new technique. These samples were treated under ambient temperature and pressure for 15 min before the complete digestion time for each sample was measured by analyzing the produced CO2 concentration. After digestion, residual O3 dissolved in solution was quantified by the indigo method. A linear relationship between the O3 consumption and COD value was observed, and the slope of calibration curve was determined to be 0.34 with a R 2 of 0.991. Detection limit of the current experimental setup is 0.81 ppm with a measurement range of 1–25 ppm. The precision of the COD measurement is within 5% of the actual concentration. This developed UV/O3 method demonstrates viability in being applied to fast, reliable, and accurate COD monitoring.

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Acknowledgements

This work was supported by the Fundamental Research Funds for the Central Universities (JUSRP51510), the 111 Project of China (B12018), and the National Natural Science Foundation of China (61273070).

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Authors and Affiliations

  1. Scholl of Internet of Things Engineering and Key Laboratory of Advanced Process Control for Light Industry (Ministry of Education), Jiangnan University, 1800 Lihu Avenue, Wuxi, Jiangsu, China, 214122

    Xiaodong Yu & Huizhong Yang

  2. Department of Mechanical Engineering and Texas Center for Superconductivity, University of Houston, 4800 Calhoun Rd., Houston, TX, 77004, USA

    Li Sun

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  1. Xiaodong Yu
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  2. Huizhong Yang
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  3. Li Sun
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Correspondence to Li Sun.

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Yu, X., Yang, H. & Sun, L. Determination of Chemical Oxygen Demand Using UV/O3 . Water Air Soil Pollut 227, 458 (2016). https://doi.org/10.1007/s11270-016-3154-y

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  • DOI: https://doi.org/10.1007/s11270-016-3154-y

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