Simultaneous determination of 16 polycyclic aromatic hydrocarbons in source water and tap water by performance liquid chromatography with ultraviolet detector tandem fluorescence detector combined with solid phase extraction

Abstract

To establish a rapid method for simultaneous determination of 16 polycyclic aromatic hydrocarbons(PAHs) in source water and tap water by performance liquid chromatography(HPLC) with ultraviolet detector(UV) tandem fluorescence detector(FLR). Source water was filtered by GF/C glass fiber filters and tap water were added ascorbic acid of 60 mg per liter to remove the residual chlorine when sampling. 500 mL water sample were sampled and adjusted pH 2 with phosphoric acid, then 10 mL methanol were added. Then samples were concentrated by styrene stilbene polymer solid phase extraction column, after loading samples, 50 percent methanol aqueous solution adjust pH 2 were used for washing bottle and the washed solution were continuum loaded. Then 80 percent methanol aqueous solution was used for removing impurity interference and elution with dichloromethane. The eluent was nitrogen blow to near dry after adding 100 μL 10 percent tween-20 methanol solutions(m/V). Acetonitrile was used for reconstitution, and then separated by PAH chromatography column using acetonitrile and pure water at gradient elution, and detected by UV tandem FLR detector. The linear ranges of 16 PAHs were 0. 5 to 500 ng/mL and the correlation coefficients were greater than 0. 999. The method detection limit and limits of quantification were 0. 3 to 5. 0 ng/L and 1. 2 to 20. 0 ng/L, respectively. The recoveries were in the range of 67. 2%-114. 1% with the relative standard deviations ranging from 1. 5%-14. 0%(n=6). Then the established method was used for the determination of 17 water samples, 8 kinds, 6 kinds and 7 kinds of PAHs were detected in source water, tap water and pipe net tap water, respectively. The method is rapid, sensitive and selective, and has been successfully applied for determination of 16 PAHs in source water and tap water.