Detection of Polycyclic Aromatic Hydrocarbons in Rural Drinking Water of Huaian City by GC-MS

Thirty four water samples from eight villages of 4 towns in a county of Huainan were collected in July(high flow period) and December in 2010(low flow period).The water samples from deep underground water and shallow groundwater were analyzed for 16 PAHs by solid phase extraction(SPE) coupled with GC-MS.Concentrations of total PAHs in deep underground water during high and low flow period were respectively ng/L 496.18ng/L to 1035.06ng/L and from 82.60ng/L to 329.03ng/L.Concentrations of total PAHs in shallow groundwater during high and low flow period were respectively from 474.69ng/L to 2310.44ng/L and from 81.39ng/L to 518.81ng/L.Concentrations of total PAHs in high flow period were higher than in low flow period.Benzo(a)pyrene concentrations in five samples exceeded the standard level,and the maximal concentration of benzo(a)pyrene was 0.69 times higher than the standard level.The human body health risk of PAHs was assessed by the optimal USEPA assessment model,and the risk level was in the range of 2×10-8— 3.92×10-6,and the carcinogenic risk of some water samples exceeded the recommended risk index(10-6).