Distribution and source apportionment of polycyclic aromatic hydrocarbons in water from suburban type underground river

Water samples in Qingshuiquan underground river were collected to investigate the composition,distribution and sources of 16 priority polycyclic aromatic hydrocarbons( PAHs).PAHs were measured by GC / MS. The results showed that the total concentration of 16 PAHs ranged from 162. 13 ng·L-1to 224. 99 ng·L-1in underground river,with an average concentration of191.71 ng·L-1. The PAHs profiles were dominated by 4 ring PAHs,which accounted for 47.14% of16 PAHs. The PAHs levels increased from upstream to downstream reaches of the river. The ratios of2 to 3 rings PAHs first increased then decreased. The PAHs in upstream area mainly came from the combustion of grass, wood and coal. The PAHs in the middle and downstream areas mainly originated from petroleum in Ganhuai village. And the PAHs in the outlet of the underground river mainly came from both petroleum and combustion.