| Thirty-two groundwater samples and six surface water samples were collected from the typical vegetable bases in the outskirts of Xi'an. Concentrations of polycyclic aromatic hydrocarbons in the samples were analyzed using gas chromatograph with mass selective detection (GC/MS). The results showed that the total polycyclic aromatic hydrocarbons concentrations in the groundwater varied from 247.05 ng·L-1 to 1 867.18 ng·L-1, and the concentrations were 357.24～2 016.57 ng·L-1 in the surface water. Compared with other regions, the pollution levels were at mid-low pollution levels in the groundwater and surface water. Based on molecular marker analysis, the sources of polycyclic aromatic hydrocarbons in water of Xi'an were mainly combustion sources, particularly wood, coal and oil fuel combustions etc. The result on BaP concentration in Xi'an water samples suggested an adverse health risk. In conclusion, this study could provide references for strengthening the prevention and control of the pollution of polycyclic aromatic hydrocarbons in Xi'an. |