Dichromate Versus Ceric Sulphate in COD Determinations

by M. A. El-Dib,
F. M. Ramadan,

Serial Information: Journal of the Sanitary Engineering Division, 1966, Vol. 92, Issue 2, Pg. 97-102

Document Type: Journal Paper


The oxidizing powers of dichromate and ceric sulphate are investigated with various catalysts. The study includes 32 pure organic compounds of various chemical structures. The highest possible oxidation yield is obtained with dichromate in the presence of silver sulphate as a catalyst. Oxidation by ceric sulphate is considerably enhanced by using chromium catalyst. However, certain organic compounds undergo oxidation only in the presence of a double catalyst, namely, Cr plus Ag. Silver and chromium tend to enhance ceric reactions prominently with compounds such as o-cersol, o-toluidine, acetylacetone, acetic acid, lactic acid, succinic acid, and alanine.

Subject Headings: Oxidation | Acids | Oxygen demand | Organic compounds | Chromium

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