[Pollution fingerprints and sources of perfluorinated compounds in surface soil of different functional areas]

In order to explore the effect of regional functions on the pollution fingerprints and levels of perfluorinated compounds (PFCs), principal components analysis was combined with high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) and solid phase extraction enrichment in this research to analyze the levels of 14 PFCs species in 76 surface soil samples, which were collected from 4 functional regions, namely parks, communities, crossroads and surroundings of factories, as well as the urban background of Shenzhen. The results showed that regional functions had significant effect on total PFCs (sigma PFCs), which ranked as the following: surroundings of factories (P < 0.001) >> crossroads (P < 0.01) >> communities (P < 0.05) >> parks > urban background. The distribution of PFCs was in the order of medium- (P < 0.05) >> long- > short-chain PFCs in surroundings of factories, communities and crossroads, while in the order of medium- approximately short- (P < 0.05) >> long chain PFCs in crossroads. Over 81% of sigmaPFCs in the surface soil of Shenzhen could be attributed to the three principal components, represented by perfluorooctane sulfonate, perfluorooctane acid and perfluorotridecanoic acid, respectively. PFCs fingerprints were clearly shown in crossroads, as well as in surroundings of electroplating and paint factories.