New laser luminescent analyzers for analytical control of the environment

Abstract New laser-induced fluorescence method (LFM) are proposed for determination of uranium (VI) in concentration range of i07 — 10_i g/ml and policyclic aromatic hydrocarbons (PAH) in concentration range i0 — 5 10_10 g/ml in the environment.A repetive pulsed laser, spectral and time discrimination and averaging technique are used. LFM does not needa preconcentration step or separation of uranium (VI) and PAH from interfering elements. By using LFM new luminescent analyzers were made. The use of the analyzers, made possible to perform the uranium (VI) and PAHdetermination both in static and dynamic conditions. The time needed for analysis is only 1—3 minutes. The luminescence method is widely used for determination of low concentrations of different organic and inorganic compounds in solutions and solid materials. The method does not need a preconcentration step or even a separation from interfering elements, which may act as quenchers of the compound fluorescence or exhibit a luminescence of their own that overlaps that of the compound but these interferences are the reason for the high