
Keywords: PAHs، هیدروکربن های چند حلقه ای معطر; UCG, underground coal gasification; PAHs, polycyclic aromatic hydrocarbons; TU, toxic units; BTEX, benzene, toluene, ethylbenzene, xylene; EC, effective concentration; BOD-5, five days biochemical oxygen demand; COD, chemical oxygen demand; EC20, threshol