Interference of Potassium Persulphate and Hydrogen Peroxide in the COD Test

Document Type : Technical Note

Authors

1 Assoc. Prof. of Environmental Health, School of Medical of Sciences, Tarbiat Modares University

2 Ph.D. Student of Environmental Health, Tarbiat Modares University

3 Assist. Prof. of Institute of Water and Energy, Sharif University of Technology

4 Assist. Prof. of Environmental Health, School of Medical of Sciences, Tarbiat Modares University

Abstract

In this research, potassium persulphate and hydrogen peroxide were investigated for their interference in the chemical oxygen demand (COD) test in the presence of reactive blue 19 dye. The chemical oxygen demand (COD)test is widely used for the estimation of the organic carbon content of water and wastewater. The test is prone to disturbance by such inorganic substances as nitrite, chloride, ferrous ion, and sulfide. The interference of chloride and nitrite may be prevented by adding mercuric sulfate and sulphamic acid, respectively. However, the interferences of persulphate and hydrogen peroxide are not mentioned in references. This research was carried out to show how persulphate and hydrogen peroxide interfere with the COD analysis. Results showed that samples containing various concentration of K2S2O8 and with no organic substances H2O2 had different COD values. It is recommended that the interference of persulphate and hydrogen peroxide should be noticed when running the chemical oxygen demand tests.

Keywords

References

1- APHA., AWWA., WPCF.(2005). Standard methods for examination of water and wastewater,  21st Ed., Washington, D.C.
2- Vaidya, B., Watson, S. W., Coldiron, S. J., and Porter, M. D. (1997). “Reduction of chloride ion interference in chemical oxygen demand (COD) determinations using bismuth-based adsorbents.” Analytica Chimica Acta,  357, (1-2), 167-175.
3- Belkin, S., Brenner, A., and Abeliovich, A. (1992). “Effect of inorganic constituents on chemical oxygen demand I. Bromides are unneutralizable by mercuric sulfate complexation.” Water Res., 26 (12), 1577-1581.
4- Belkin, S., Brenner, A., and Abeliovich, A. (1992). “Effect of inorganic constituents on chemical oxygen demand II. Organic carbon to halogen ratios determine halogen interference.” Water Res., 26 (12), 1582-1588.
5- Kurbus, T., Slokar, Y. M., and Marechal, A. M. (2002). “The study of the effects of the variables on H2O2/UV decoloration of vinylsulphone dye: part II.” Dyes Pigments, 54, 67-78.
6- Lee, Y. H., and Pavlostathis, S. G. (2004). “Decolorization and toxicity of reactive anthraquinone textile dyes under methanogenic conditions.” Water Res, 38 (7), 1838-1852.
7-Villanueva, S. F., and Martínez, S. S. (2007). “TiO2-assisted degradation of acid orange 7 textile dye under solar light.” Sol. Energy Mater. Sol. Cells, 91, 1492-1495.
8- Aleboyeh, A., Aleboyeh, H., and Moussa, Y. (2003). “Critical effect of hydrogen peroxide in photochemical oxidative decolorization of dyes: Acid Orange 8, Acid Blue 74 and Methyl Orange.” Dyes Pigments., 57, 67-75.
9- Khan, E., and Subramania-Pillai, S. (2007). “Interferences contributed by leaching from filters on measurements of collective organic constituents.” Water Res., 41, 1841-1850.
10- Watts, R. J., and Dean Adams, V. (1983). “The elimination of sulfur dioxide interferencein the low level chemical oxygen demand analysis.” Water Res., 17(6), 715-718.
Journal of Water and Wastewater; Ab va Fazilab ( in persian )
Volume 19, Issue 2 - Serial Number 2
Serial number:66
May and June 2008
Pages 77-81

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