Standard: PAPTAC - H.3
CHEMICAL OXYGEN DEMAND
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In general, this method will be used on unfiltered samples. In the case of these samples, suspended organic solids present will be largely or completely oxidized during the test and will therefore contribute to the COD result obtained on the test specimen. It must be recognized that the presence of suspended solids may impose a significant problem in obtaining representative aliquots. Where it is desired to measure the COD of the dissolved solids only, samples must be filtered through a medium retentive filter paper (Note 1).
The method is used to determine COD levels up to 500 mg/L directly on undiluted test specimens. This range can be extended upwards by appropriate dilution of the test specimen.
It may be desirable or necessary to filter samples which contain gross heterogeneities which are obviously not representative of the water or wastewater stream under examination. If the sample has been filtered, this must be stated in the report.
|Organization:||Pulp and Paper Technical Association of Canada, Formerly CPPA|
|Change Type:||COMPLETE REVISION|
|Most Recent Revision:||YES|
|Document #||Change Type||Update Date||Revision||Status|
|H.3||Change Type: STCH||Update Date: 2006-06-01||Status: INAC|
|H.3||Change Type:||Update Date: 1993-08-01||Status: INAC|
|H-3||Change Type: STCH||Update Date: 1970-01-01||Status: INAC|