Test Method 98-2012
in Bleach Baths Containing Hydrogen Peroxide
in 1960 by AATCC Committee RA34
Purpose and Scope
This test method determines the total alkali content of a bleach bath containing
hydrogen peroxide and alkali from any source. The total alkali content is
expressed as % sodium hydroxide.
1.2 Alkali in bleach baths may be supplied
by sodium hydroxide, sodium silicate, sodium carbonate, or by various other alkaline
materials, including potassium compounds, ammonia, lime, or by peroxygen solids
which contain alkaline salts.
1.3 The alkali content of a bleach bath
is a critical parameter in determining the rate and extent to which the textile
being bleached is affected by the bleaching process.
1.4 This test method
is used for laboratory determinations and for process control.
A weighed specimen of the bleach bath is titrated with a standardized solution
of sulfuric acid to a Phenol Red endpoint, or to the pH range 6.8-8.4 on a pH
meter. The total alkali, expressed as % NaOH, is calculated based on the
weight of the bath.
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