Analytical Sciences

Abstract − Analytical Sciences, 32(11), 1257 (2016).

Quantitative Determination of NTA and Other Chelating Agents in Detergents by Potentiometric Titration with Copper Ion Selective Electrode
Sana ITO and Masaki MORITA
Niitaka Co., Ltd., 1-8-10 Niitaka, Yodogawa, Osaka 532-8560, Japan
Quantitative analysis of nitrilotriacetate (NTA) in detergents by titration with Cu2+ solution using a copper ion selective electrode was achieved. This method tolerates a wide range of pH and ingredients in detergents. In addition to NTA, other chelating agents, having relatively lower stability constants toward Cu2+, were also qualified with sufficient accuracy by this analytical method for model detergent formulations. The titration process was automated by automatic titrating systems available commercially.