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Underground storage tanks are used to store petroleum and the major constituents of gasoline, including benzene, toluene, ethylbenzene and tylene (collectively known as BTEX). Many of these tanks are known to have developed leaks, allowing gasoline, diesel or other compounds to contaminate the surrounding soil. In 1992, two million underground tanks were monitored for leaks. Since that time, the number of suspected leaking underground fuel tanks has increased.

Dionex developed ASE® technology to facilitate the extraction of total petroleum hydrocarbons (TPH) and BTEX from a variety of matrices using a fraction of the time, solvent and overall cost of traditional Soxhlet extraction.