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The present paper is devoted to the results of long-term field observations of oil pollution transformation in sma ll watercourses of the Lower Don River basin (Russia), on the Atlantic coast of France and in the Strait of Kerch polluted by spilled oil. The investigations included visual assessment and sampling of oil slicks, water and sediment cores. The analysis of samples were carried out with the use of th in layer and column chromatography, optical and gravimetri c methods making possible to determine separat...