The most common route of soil and groundwater contamination is leaking underground storage tanks (USTs), that are used by gas station, industrial, and residencial compounds. Over 418,000 UST releases had been confirmed as of September 30, 2001 in the USA. There are no precise numbers for contaminated sites in Brazil, but it's easy to suppose that many exist. Contamination of soil and water by gasoline and Diesel from leaking underground storage tanks (USTs) may result in serious environmental problem. The objective of this study was to investigate the sorption of toluene, xylene and Diesel by organoclays produced from Brazilian bentonites (AM2, SVC) with hexadecyltrimethylammonium (HDTMA), as well as by a commercial peat. The test used is based on Standard Methods of Testing Sorbent Performance of Adsorbents (ASTM F 72699) and Standard Methods of Testing Sorbent Performance of Absorbents [ASTM F 716-82 (Reapproved 1993)]. The organoclays (SVC-HDTMA and AM2-HDTMA) were characterized by X-Ray Diffraction. The data showed that the sorption capacity of the organoclays ranged from 8.5 g sorbed/g sorbent to 14 g sorbed/g sorbent. The peat sorb organic compounds equal to about 8 times its weight. The results suggest that these sorbents are effective to sorb toluene, xylene, and Diesel oil.