Quantitative Determination of NTA and Other Chelating Agents in Detergents by Potentiometric Titration with Copper Ion Selective Electrode

Abstract

Quantitative analysis of nitrilotriacetate (NTA) in detergents by titration with Cu 2+ 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 Cu 2+ , 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.

Copper Ion Sensing

“…Ito and co-workers determined the concentration of nitrilotriacetate and other chelating agents in detergents by titration of copper ions. 13 Wu and co-workers used the absorption of copper ions at around 800 nm (copper aquo complex) as a means of evaluating the performance of microfluidic optical cells. 14 As described above, copper ions are important metal ions, which are often analyzed for various purposes and by various methods.…”