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A Rapid Determination Method of Chemical Oxygen Demand in Printing and Dyeing Wastewater Using Ultraviolet Spectroscopy

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A rapid method to determine chemical oxygen demand (COD) in printing and dyeing wastewater using ultraviolet (UV) spectroscopy was developed in this study. The UV method has several advantages compared to the chemical method, such as shortened analysis time, convenience, no requirement of expensive and toxic reagents, and good reproducibility. It was established that the magnitude of COD and, to a certain extent, pH and suspended solids of the sample have effects on the accuracy and precision of the method. The results showed the fitting range of CODCr (COD determined by the dichromate method) was 0 to 360 mg/L−1 And the pH ranged from 2.45 to 9.22. If the UV365 (UV absorbance at 365 nm) is measured and is subtracted from UV254 (UV absorbance at 254 nm), then the effects of suspended solids was eliminated. A control experiment of CODCr determination using the rapid method and the standard dichromate method was carried out, which validated the former.
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Keywords: UV absorbance; and printing and dyeing wastewater; chemical oxygen demand

Document Type: Research Article

Publication date: 2009-11-01

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    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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