Determination of water organic pollution and measure of the chemical oxygen demand (COD) for oxidoreduction application

Determination of water organic pollution and measure of the chemical oxygen demand (COD) for oxidoreduction application The aim of this study is to illustrate the oxidoreduction reactions for the determination of the organic pollution in water. Firstly, the chemical oxygen demand (COD) is defined and the principle of the spectrophotometric dosage is remained. Then, a saccharose solution is analysed. A titration of the excess dichromate by the iron (II) and a spectrophotometric dosage of chrome (III) are performed. The results obtained are expressed in terms of COD.