Journal
DESALINATION
Volume 239, Issue 1-3, Pages 139-145Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.desal.2008.03.014
Keywords
COD; Potassium dichromate method; Spectrophotometry; Calibration curves; Home-made reagents
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Funding
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan
- Kaidi Water Service Co.. Ltd
- Wuhan economic development zone wastewater treatment plant
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A novel spectrophotometric assay method using home-made reagents that can be used to determine the chemical oxygen demand (COD) in real wastewater is described. The home-made reagents were used instead of the American Hach reagents. The principle of measurement was based on direct determination of the concentration change that Cr(6+) is reduced intensely to Cr(3+) resulting from potassium dichromate oxidation of organic compounds. The method of home-made COD reagents has been introduced. The good calibration curves for COD values between 0-1500 mg l(-1) were obtained. The proposed method has the advantages of high selectivity, good sensitivity, fast reaction time, economy, good precision and accuracy and high stability. The method was successfully applied to determine the COD concentration of real wastewater from an urban wastewater treatment plant. The results compared fairly well with data obtained using the standard method.
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