AATCC Test Method 185-2011
Chelating Agents; Percent Content in Hydrogen Peroxide Bleach
Baths; Copper PAN Indicator Method
Developed in 1998 by AATCC Committee RA90
1. Purpose and Scope
This test method measures the chelating agent content in a hydrogen peroxide bleach
2.1 The percent chelating agent or product in the hydrogen peroxide bleach bath is determined in two steps: first, a direct titration of the chelating agent or product using a known concentration of copper sulfate in the presence of an indicator (PAN, 1-(2-pyridylazo)-2-naphthol), and second, a similar titration of the bleach solution containing the chelating agent using a more dilute concentration of copper sulfate as the titrant.
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