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# Alternatives to a Silver Catalyst in Chemical Oxidation Demand Analysis

Leown Moore
Journal (Water Pollution Control Federation)
Vol. 48, No. 10 (Oct., 1976), pp. 2327-2331
Stable URL: http://www.jstor.org/stable/25040028
Page Count: 5
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## Abstract

Because the silver catalyst used in chemical oxidation demand analysis has become quite expensive (about $660/kg${\rm Ag}_{2}{\rm SO}_{4}$) and is unavailable at times, possible alternative procedures were sought. The alternatives investigated were: (a) eliminating the use of a catalyst; (b) using a catalyst other than${\rm Ag}_{2}{\rm SO}_{4}$; and (c) using reduced amounts of${\rm Ag}_{2}{\rm SO}_{4}$and determining the relationships between the concentration of catalyst, the reflux time, and the percentage of oxidation efficiency. The best alternative was to reduce the quantity of${\rm Ag}_{2}{\rm SO}_{4}\$ used in the procedure. The amount of catalyst may be reduced to one-third the specified amount with a corresponding decrease of only 3 percent in the oxidation efficiency of acetate, a material quite resistant to oxidation by the chemical oxidation demand procedure.

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