Selective titration of microgram amounts of copper with photometric end-point detection.
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.
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Laboratory for Analytical Chemistry, University of Amsterdam, Amsterdam-C, Netherlands.