The voltammetric method for the determination of naphthalene, fluorene and anthracene by their anodic oxidation at a glassy carbon or carbon paste electrode using the mixed water-organic solvent media is described. The compositions of mixed media are the following: 0.1 mol l^–1 H₂SO₄ as an aqueous component with 20% (by volume) of methanol for naphthalene or 25% of acetonitrile for fluorene and anthracene. The detection limits using the glassy carbon electrode for naphthalene, fluorene and anthracene are 12, 6.4 and 1.2 μmol l^–1, respectively. The oxidation peak potentials vs. saturated Ag/AgCl electrode are the following: +1.54 ± 0.01 V for naphthalene, +1.61 ± 0.01 V for fluorene and +1.21 ± 0.01 V for anthracene. The adsorptive accumulation using the carbon paste electrode decreases the detection limit of anthracene to 0.2 μmol l^–1. Very close oxidation peak potentials of naphthalene and fluorene do not allow the simultaneous determination of all three analytes. However, due to its high volatility naphthalene can be removed quantitatively during the process of the evaporation of hexane extract. The results of the determination of anthracene and fluorene in spiked environmental samples are presented.

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