Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Catalytic Decomposition of the Excess Reagent in the Spectrophotometric Determination of Copper(II) with o,o′-Dihydroxyazo Compounds
Masao SugawaraYuh’ichi RokugawaTomihito Kambara
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1977 Volume 50 Issue 12 Pages 3206-3208


A simple and sensitive spectrophotometric method for determination of copper(II) is described. It is based on the reaction of copper(II) with Hydroxynaphthol Blue in the weakly alkaline medium and the decomposition of the unconsumed reagent which shows an intense absorption at the wavelength, 555 nm, of the maximum absorbance of the copper(II) complex. Beer’s law is obeyed over the range 0.13–1.27 ppm copper with the molar absorption coefficient of ε555=3.01×104 dm3 mol−1 cm−1 (Sandell’s sensitivity 2.11×10−3 μg/cm2). A fairly large number of common ions except for nickel(II) do not interfere.

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