Fig. 3. Relative headspace concentration of chlorinated hydrocarbons as a function of time in a batch experiment containing 20 g soil pre-exposed to landfill gas. (A) Chlorinated methanes. (B) Chlorinated ethylenes. (C) Chlorinated ethanes. (D) Chlorofluorocarbons. (E) Hydrochlorofluorocarbons. (F) Hydrofluorocarbons. (G) Aromatic hydrocarbons.