TM185-TM 185 Chelating Agents: % in Hydrogen Peroxide Bleach Baths

TM185-TM 185 Chelating Agents: % in  Hydrogen Peroxide Bleach Baths




AATCC TM185-2021 Test MEthod for Chelating AGent Content in Hydrogen Peroxide Bleach Baths: Copper PAN Indicator. 


Developed in 1998 by AATCC Committee RR90; reaffirmed 1999, 2000, 2006, 2011, 2016; editorially revised 2010, 2019; revised 2021


1. Purpose and Scope


1.1 This test method measures the chelating agent content in a hydrogen peroxide bleach solution.

1.2 The method is designed to permit routine or periodic titration of the peroxide saturator section of a plant preparation range, or other prepared peroxide bleach solutions, to determine the concentration of chelating agent present.

1.3 The method is restricted to chelating agents based on ethylenedianietetraacetic acid (EDTA), N-hydroxyethylenediamenetriacetic acid (HEDTA), and diethylenetriaminepentaacetic acid (DTPA). This includes any proprietary products (referred to herein as "product") containing possible multiple ingredients, one or more of which may be chelating agents.


2. Principle


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.


Copyright American Association of Textile Chemists and Colorists, RTP, NC, USA. All rights reserved.


The above information is only a summary of the AATCC test method.

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