A laboratory chromatograph for analysis of trace amounts of petroleum products in water using steam as a carrier gas was proposed. The original design of a trap for sample preparation based on solid-phase microextraction was described. Measurements were made on a model solution of benzene, toluene, ethylbenzene, and o-xylene in water over the concentration range of 3 to 100 mu g/dm(3). The solubility of AI-92 (RON 92) gasoline and diesel fuel in water was measured. It was shown that the solubility of diesel fuel at room temperature in water did not exceed 12.9 +/- 0.7 mg/dm(3). The solubility of decane in water was measured, which turned out to be 0.18 +/- 0.01 mg/dm(3).