2003•Journal of Yunnan University for NationalitesRequires access

Study on Spectrophotometric Determination of Copper with 2,7-Di-(Antipyrinylazo-)-Chromotropec Acid

Dong Xue-chang

Abstract

The color reaction of copper with 2,7-Di-(Antipyrinylazo-)-Chromotropec Acid,was studied.In the presence of pH 11 buffer solution,2,7-Di-(Antipyrinylazo-)-Chromotropec Acid,reacts with copper(Ⅱ)to form a stable 1∶1 complex.The molar absorptivity is 5 16×10 4L.moL -1.cm -1 at 590 nm. Beer's law is obeyed in range of 0～30 μg/25mL.This method was applied to the determination of copper in lead With good results.

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Key concepts: Molar absorptivity, Copper, Chemistry, Color reaction, Spectrophotometry, Buffer solution, Nuclear chemistry, Inorganic chemistry