Abstract:

A method for rapid determination of naphthalene, acenaphthylene, acenaphthene, fluorene, phenanthrene, anthracene, fluoranthene, pyrene, benzo(a)anthracene, chrysene, benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(j)fluoranthene, benzo(e)pyrene, benzo(a)pyrene, indeno(1,2,3-cd)pyrene, dibenzo(a,h)anthracene, benzo(g,h,i)perylene in plastic products by ultra performance convergence chromatography (UPC²) coupled photodiode array detector (PAD) was developed. The 18 polycyclic aromatic hydrocarbons (PAHs) were successfully separated in less than 8.5 min on a Daicel IB-3 chiral column with a mobile phase of CO₂, the mobile-phase additive of methanol/acetonitrile (25:75, v/v) at column temperature of 40 ℃, and a back pressure of 15.17 MPa. There was a linear correlation between peak area and PAH concentration in the range of 0.05-50 mg/L (r≥0.9995) for each PAH. The limits of quantification (LOQs) (S/N> 10) were 0.05 mg/L. After ultrasonic-assisted extraction in toluene, the sample was analyzed by UPC²-PDA. The recoveries of PAHs spiked in plastic samples were from 78.3% to 117.6%, and the repeatabilities of peak areas for the 18 PAHs were less than 5% (RSD, n=5). The present UPC²-PDA method has the advantages of rapid speed, high resolution, and low organic reagent consumption.

Key words: photodiode array detector (PDA), plastic products, polycyclic aromatic hydrocarbons (PAHs), ultra performance convergence chromatography (UPC²)