Standard: PAPTAC - H.5


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This method of measuring colour can be applied to sulphate (kraft) and sulphite pulp mill effluents, providing their colours closely match the colour of the standard platinum-cobalt solution. The method cannot be applied to effluents of unusual colour, i.e., to dyed solutions.

Pulp mill effluents and the standard platinum-cobalt colour solution have a similar dominant wavelength of transmitted light at 570-580 nm and the complementary wavelengths of absorbed light range between 450-480 nm (see Additional Information). The wavelength of 465 nm is used in this method for measuring the absorption of light by mill effluents.

The colour of an effluent is expressed in arbitrary colour units. One colour unit (C.U.) is equivalent to the absorption of light at the wavelength of 465 nm by 1 mg/L platinum in the platinum-cobalt standard solution.

Organization: Pulp and Paper Technical Association of Canada, Formerly CPPA
Document Number: h.5
Publish Date: 2006-06-01
Page Count: 3
Available Languages: EN
DOD Adopted: NO
ANSI Approved: NO
Most Recent Revision: YES
Current Version: YES
Status: Active

Document History

Document # Change Type Update Date Revision Status
H.5 Change Type: Update Date: 1993-08-01 Status: INAC