Metrohm NIRS DS2500 liquid analyzer can control the quality of acid baths for etching of microelectronics and printed electronics. Not only are analysis times sharply reduced to less than a minute, the related running costs are also significantly lower – certainly a boost in efficiency that should not be overlooked.

Mixed acid solutions based on four different acids were measured in transmission mode with a DS2500 Liquid Analyzer over the full wavelength range (400–2500 nm). Disposable vials with a pathlength of 4 mm were 

used for convenient and fast measurement. The Metrohm software package Vision Air Complete was used for all data acquisition and prediction model 

development. 

DS2500 Liquid Analyzer can determine concentrations of individual acid in a mixed acid solution. Vis-NIR spectroscopy enables fast determinations with high accuracy, and therefore represents a suitable alternative to the standard method.