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In this work, the nonionic surfactant polyoxyethylene-10-lauryl ether has been used for the extraction and preconcentration of 14 polycyclic aromatic hydrocarbons, classified as priority pollutants by the US Environmental Protection Agency, from seawater samples. The cloud-point preconcentration previous separation by HPLC and quantification using fluorimetric 2 detection and wavelength programming allow to determine these pollutants with detection limits ranging from 1.0 to 1.5?10 ng / l with RSDs better than 10.4%. The methodology is evaluated using well-established extraction and preconcentration methods and GC-MS. © 2002 Elsevier Science B.V. All rights reserved.

A fast microwave-assisted dansylation procedure has been developed for the derivatization of biogenic amines prior to HPLC determination. Putrescine, cadaverine, spermidine and spermine are quantitatively dansylated in 5 min using a radiation power of 252 W and a maximum pressure of 3.4 bar inside the reactor. As compared to classical overnight dansylation, the microwave-assisted procedure is 150-times faster. Data concerning repeatability and recovery of method are reported. The method was successfully applied to the determination of the above amines in plant tissues.