Catalytic Kinetic Spectrophotometry Determination of Trace Copper(II) by H2O2 Oxide Acid Fuchsin

Abstract

In this work, kinetic spectrophotometric method for the determination of trace amounts of Cu(II) in the range of 4.0-24 ng mL^-1 is reported. The method is based on the catalytic effect of Cu(II) on the oxidation reaction of acid fuchsin by hydrogen peroxide in presence of dilute sulphuric acid (pH = 2.5). The reaction is followed by spectrophotometrically by measuring the change in absorbance (DA) at 546 nm using a fixed time method (6 min). The reaction variables were optimized in order to achieve the highest sensitivity. The 3 s criterion detection limit was 1.36 ng mL^-1 and the method was successfully applied to the determination of copper(II) in Songhuariver of Heilongjiang province in China.