or probable human carcinogens, and hence their distribution in the environment and possible exposure to humans have been the focus of much attention (1, 2). The eight PAHs that are typically considered as possible or probable carcinogens are: benzo[a]anthracene, chrysene, benzo dibenzo-[a,h]anthracene and benzo[g,h,i]perylene (1, 2).PAHs are introduced into the environment via natural and anthropogenic combustion processes. Volcanic eruptions and forest and prairie fires are among the major sources of naturally produced