Santelli Francesca, Boscaino Floriana, Laratta Bruna et al, Determinazione di polidorodibenzo-p-diossine (PCDD), policlorodibenzo-p-furani (PCDF) e policlorobifenili (PCB) in oli essenziali agrumari estratti a freddo. Essenze e derivati agrumari 2005, vol. 75, no2, pp. 71-82

The presence of polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzo-p-furans (PCDFs) and polychlorinated biphenyls (PCBs) in 17 essential oil samples producted in Calabria and Sicily in 2003-2004 has been investigated. The analytical method used follows the European Directive 2002/69/EC guidelines. The extraction and clean up method resulted in an efficient separation of PCDD/Fs and PCBs from other interfering compounds. Analysis was carried out using an isotopic dilution method in conjunction with High Resolution Gas Chromatography-High Resolution Mass Spectrometry (HRGC-HRMS). Samples analysed as part of this survey show the presence of distinct PCDDs and PCDFs congeners like OCDD, HpCDF and OCDF in concentrations higher than the other congeners. The presence of non-2,3,7,8 chlorine substituted dioxins and furans congeners has been detected. High concentrations of PCBs congeners have also been found. As the essential oils industrial production processes don't involve any possible sources of contamination, the presence of PCDDs, PCDFs and PCBs found in the samples analysed might come from a diffuse environmental contamination.