title: Selective titration of microgram amounts of copper with photometric end-point detection.
abstract: The reaction of copper ions with pyridylazonaphthol is very suitable and sensitive for the photometric titration of copper. The titration is self-indicating, and at the 0.1-ppm level the standard deviation is 2.5%. The main interferences are caused by bismuth, iron, titanium and vanadium but can be overcome by suitable masking.
authors.affiliation: Laboratory for Analytical Chemistry, University of Amsterdam, Amsterdam-C, Netherlands.
authors.forename: H
authors.initials: H
authors.lastname: Poppe