TM168-TM 168 Chelating Agents: Polyaminopolycarboxylic Acids; Copper PAN Method

Description

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TEST METHODS ARE DELIVERED AS A LINK IN YOUR EMAILED RECEIPT.

AATCC TM168-2023, Chelation Value of Polyaminopolycarboxylic Acids and their Salts: Copper PAN Method

Developed in 1987 by AATCC Committee RR90; reaffirmed 1988 (with title change), 2002, 2012; editorially revised and reaffirmed 1989, 1997, 2007; revised 1992, 2018 (with title change), 2023; editorially revised 2010, 2019.

Foreword

This test method is an alternate to AATCC TM149, Test Method for Chelation Value of Aminopolycarboxylic Acids and Their Salts: Calcium Oxalate. Titration with a calcium salt using either oxalate or a dye indicator, as in AATCC TM149, yields a value that includes partially-substituted EDTA, HEDTA, DTPA, nitrilotriacetic acid (NTA), iminodiacetic acid (IDA), glycolate and other weak chelating agents found in some commercial products. This alternative procedure excludes the effect of the partially-substituted products, providing a more stringent value.

1. Purpose and Scope

1.1 The active content of ethylenefiaminetetraacetic acid (EDTA), N-hydroxyethylenediaminetriacetic acid (HEDTA) and diethylenetriaminepentaacetic acid (DTPA) and their salts is usually expressed by the calcium chelation value (CaCV). This value indicates the amount of calcium (as calcium carbonate) which will be chelated by a known weight of chelating agent. This method excludes the effect of partially-substituted products.

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