Due to the interference of chloride ions in saline environments, chemical oxygen demand (COD) is not possible with existing standard methods such as acid oxidation with potassium dichromate. Therefore, finding a method for COD that do not has the effect of the interfering, it can be helpful. The present research aims to provide spectrophotometric method for COD measurement. Potassium hydrogen phthalate was used to prepare COD calibration solutions according to the standard method. The solutions were prepared in distilled water and saline water. Based on the results of this study, water salinity did not affect absorption at 254 nm. In order to compare the method presented in this study, the standard method of oxidation of acid with potassium dichromate was carried out on 33 samples of wastewater. According to the findings, there is a good fit between the two methods (R2 = 0.98), therefore, it is suggested that the COD measurement equation based on absorption at 254 nm wavelength for saline and fresh environment. Because the proposed method of the present study does not used Chemicals, especially mercury and silver compounds, it can be suggested as an environmentally friendly method.
Salimizadeh, M., Masihi, H., Mehvari habib Abadi, A., & Doodi, S. (2019). Measurement of chemical oxygen demand (COD) in saline environments using spectrophotometric method. Ecology and Water Resources, 3(1), 12-18.
MLA
Maryam Salimizadeh; Habib Masihi; Alireza Mehvari habib Abadi; Sakineh Doodi. "Measurement of chemical oxygen demand (COD) in saline environments using spectrophotometric method". Ecology and Water Resources, 3, 1, 2019, 12-18.
HARVARD
Salimizadeh, M., Masihi, H., Mehvari habib Abadi, A., Doodi, S. (2019). 'Measurement of chemical oxygen demand (COD) in saline environments using spectrophotometric method', Ecology and Water Resources, 3(1), pp. 12-18.
VANCOUVER
Salimizadeh, M., Masihi, H., Mehvari habib Abadi, A., Doodi, S. Measurement of chemical oxygen demand (COD) in saline environments using spectrophotometric method. Ecology and Water Resources, 2019; 3(1): 12-18.
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