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A rapid and simple FAES technique for the quantification of traces of cesium in natural samples is described. A volume of 3 μL of liquid sample was placed on a Pt-wire, dried, and atomized in the methane-air flame. The flame atomization conditions of cesium were optimized, which are as follows: λ = 852.19 nm, the height of 2 mm over the burner head, gas flow rates of 200 L h^–1 air and 24 L h^–1 methane. The effect of Na, K, Mg, Ca on the emission of cesium was studied too. Boric acid, citric acid and acetone were tested, as chemical modifiers. The lowest limit of quantification (6σ) obtained is of 11.9 ± 1.2 pg in the presence of 10 % v/v acetone (P = 0.05). The cesium content of mineralwater and lichen samples has been determined by using the standard addition method. The concentration of cesium varied between 0.016–0.124 mg.L^–1 in the waters and 0.76–5.36 mg.L^–1 in the lichens. The results of the two procedures agree within the determination errors.

Keywords: flame, atomic emission, Pt-loop, cesium, water, lichen