Abstract
A catalytic kinetic spectrophotometric method is developed for the determination of trace amounts of Cu(II). It is based on the catalytic effect of Cu(II) on the oxidation of sodium pyrogallol‐5‐sulfonate (PS) by hydrogen peroxide in acidic madium. The reaction was monitored spectrophotometrically by measuring the increase in absorbance of the oxidation product at 436.8 nm. The optimum operating conditions regarding concentration of reagents, pH, and temperature were established. The working curve is linear in the concentration range from 10 to 300 ng cm−3 and the detection limit is 1.8 ng cm−3. The interference effect of several species was also investigated and it was found that the most common cations and anions do not interfere with the determination. The developed procedure was successfully applied to the determination of Cu(II) in water and milk.
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