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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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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Alternatives to a Silver Catalyst in Chemical Oxidation Demand Analysis
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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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