title: Selective kinetic spectrophotometric determination of copper at nanograms per milliliter level.
abstract: A sensitive and selective kinetic method is proposed for the determination of nanogram amounts of copper. The method is based on the catalytic effect of copper on the reduction of Ponceau S by sodium sulfide in an alkaline media. The rate of the reaction is monitored spectrophotometrically at 560 nm. The method allows determination of copper concentrations in the range 2-400 ng ml(-1) with a relative standard deviation of approximately 2%. The proposed method, which is highly selective to copper, has been applied satisfactory to its determination in real samples.
authors.affiliation: Shiraz University, Faculty of Sciences, Chemistry Department, Shiraz 71454, Iran.
authors.forename: A
authors.initials: A
authors.lastname: Safavi
authors.forename: N
authors.initials: N
authors.lastname: Maleki
authors.forename: F
authors.initials: F
authors.lastname: Farjami