engleski

Polychlorinated biphenyls, dibenzo-p-dioxins and dibenzofurans in soil samples from airport areas of Croatia

Levels and patterns of polychlorinated biphenyls (PCBs) were studied in surface soil samples collected in the coastal part of Croatia within and surrounding four different airports and in the vicinity of two partially devastated electrical transformer stations. The compounds accumulated from air-dried soil samples by multiple ultrasonic extraction with n-hexane:acetone 1:1 mixture were analysed by capillary gas chromatography with electron capture and ion-trap detection. PCBs were quantified against a standard Aroclor 1242/Aroclor 1260 mixture and a standard mixture of 17 individual PCB congeners (IUPAC No.: 28, 52, 60, 74, 101, 105, 114, 118, 123, 138, 153, 156, 157, 167, 170, 180, and 189). The mass fractions of total PCBs in 18 soil samples collected within the airport premises ranged from 3 to 41327 microgram/kg dry weight (dw) (median: 533 microgram/kg dw), and those in 21 samples collected at a distance ranging from several metres to five kilometres away from the airport fence, from <1 to 39 microgram/kg dw (median: 5 microgram/kg dw). The highest PCB levels were determined in soils along the airport aprons where the aircrafts were serviced and refuelled. PCB pattern was highly similar to technical Aroclor 1260 in all airport soils. PCB pattern in 22 soils collected in the vicinity of electrical transformer stations was dominated by congeners contained in Aroclor 1242. These soils contained 7 to >400 microgram/kg dw of total PCBs. One highly PCB-contaminated airport soil sample was analysed for polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs). With an international toxic equivalent (I-TEQ) of 9.7 ng/kg dw, the airport soil contamination was within values typical for urban and rural areas and the congener patterns gave no clear indication for PCBs as the only source of PCDDs/PCDFs.

polychlorinated biphenyls; PCB congeners; polychlorinated dibenzo-p-dioxins; polychlorinated dibenzofurans; airport soil

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