Spectrofluorimetric determination of chromium with 8-hydroxyquinoline-5-sulphonic acid

Abstract

A simple spectrofluorimetric method for the determination of Cr^VI, based on the oxidation of 8-hydroxyquinoline-5-sulphonic acid with potassium dichromate in 6.3 mol dm^–3 H₂SO₄, is described. The fluorescent species has excitation and emission maxima at 360 and 450 nm, respectively. The fluorescence intensity of the system is linear over the concentration range 5.6 × 10^–6–1.5 × 10^–5 mol dm^–3 Cr^VI. The method was applied to the determination of Cr^VI in industrial wastewater samples.