摘要：Systematic investigation of the CODMn of aldehydes and alcohols was carried out by using semimicro method previously reported. Formaldehyde was oxidized rapidly up to 74% in acidic method, but the other aldehydes decomposed gradually. The mechanism was investigated with GC method and it was clarified that aldehydes were converted to the corresponding fatty acids which were further oxidized to shorter carbon chain fatty acids. AgNO3 added to the solution promotes these reactions as catalysis. In alkaline method, aldehyde consumed oxygen rapidly and produced the corresponding fatty acid and shorter carbon chain fatty acids simultaneously. Alcohols consumed oxygen gradually in acidic method and catalytic effect of AgNO3 was recognized in the case. It seems that this effect occurs not only for fatty acids produced from alcohols but also for alcohols themselves. COD values decreased in secondary alcohols, and rather increased in tertiary alcohol with acidic method but diminished remarkably with alkaline method. These mechanisms of oxygen consumption will be very important when COD values of test samples containing aldehydes and alcohols are estimated.
