Sorption-fluorimetric determination of zinc

The sorption of ions of zinc on carriers modified by 8-oxychinoline and its derivative is investigated. The optimum parameters of sorption are revealed, based on which silochrome S-60 with immobilized 8-oxychinoline (pH 7.1, time of contact 30 min, weight of sorbent 0.3 g, capacity of sorbent on the modifier 60 μmol/g) is chosen. A yellow-green fluorescence sorbate arises on irradiation by ultra-violet light in a phase sorbent. The spectrum of fluorescence represents a wide unstructured strip with a maximum at 505 nm. In the construction of a calibrated graph, Cu(II), Cd(II), Pb (II), Bi(III), and Fe(III) do not prevent the determination of 5–50 μg of zinc; however, equal amounts of Al(III) (50–100 μg) do prevent it. The technique is applied for the sorption-fluorimetric determination of zinc in river and waste water. The relative standard deviation does not exceed 0.05 (n = 5).