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In the past, SPE using HLB (Hydrophilic Lipophilic Balanced) cartridges was widely used to analyze PFCs (perfluorinated compounds) in multi-media, but recently the trend goes to using WAX (Weak Anion-eXchange) cartridges. HLB and WAX cartridges were used for studying the extraction characteristics of PFCs. In order to investigate the influence of storage materials on PFCAs, the SPE extracted samples were stored in glass and pp vials and concentration change was measured over time. PFCAs (perfluoroalkycarboxylic acids), PFSAs (perfluoroalkansulfonate) and precursors were analyzed. Analysis using WAX cartridges showed that some of the PFCAs, PFSAs and precursors were higher than those of HLB cartridges, while some of them were low. The PFBA (C4) and PFPeA (C5) of the PFCAs show higher efficiency in the WAX cartridge with increasing sample concentration. Over time, in PFCAs less than C11 (PFUnDA) and PFSAs, no large concentration was observed on both glass and pp materials. But in the case of the PFCAs higher than C13 (PFTrDA), the concentration was gradually decreased. The concentration of PFOA and PFOS did not change much after 144 hours regardless of storage materials. As a result of decrease in ΣPFCs (22 species) concentration, it is thought that PFCs (22 species) were converted into another PFCs that were not analyzed.

Analysis Characteristics of Perfluorinated Compounds Using Solid Phase Extraction