Inhibitory kinetic spectrophotometric determination of trace copper

A system of inhibitory kinetic spectrophotometic determination of trace copper? was investigated. In the presence of manganese ? and phosphoric acid, trace amounts of Cu? inhibit the reaction which chromium? oxidizes DAmBM to form an orange-red product. The reaction condition was studied. The linear relationship between the ΔA and the concentration of Cu? is found in the range of 1.0 to 6.0 μg/25mL, and the relative standard deviation is 1.51%. The method has been applied to the determination of trace copper in aluminum alloy with satisfactory results.