AATCC Test Method 168-2012

Chelating Agents:  Active Ingredient Content of Polyaminopolycarboxylic Acids and Their Salts; Copper PAN Method

Developed in 1987 by AATCC Committee RA90

1.  Purpose and Scope

1.1  This test method is an alternate to AATCC Method 149, Chelating Agents: Chelation Value of Aminopolycarboxylic Acids and Their Salts; Calcium Oxalate Method.
1.2  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).   Titration with calcium salt using either oxalate or a dye indicator, as done in AATCC Method 149, yields a value which includes partially substituted EDTA, HEDTA, DTPA, nitrilotriacetic acid (NTA), iminodiacteic acid (IDA), glycolate and other weak chelating agents found in some commercial products.  This alternative procedure excludes the effect of partially substituted products, providing a more stringent value.


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