engleski

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

Polychlorinated biphenyls (PCB) were determined in surface soil samples collected in or close to the areas of four airports and selected industrial facilities: a former chloro-alkali-electrolysis plant, a former ferromanganese plant, and an aluminium producing plant. The pollutants were accumulated from air-dried soil samples by multiple sonicated extraction with n-hexane:acetone 1:1 mixture. The extracts purified by treatment with copper powder, mercury, and sulphuric acid were analysed by capillary gas chromatography. PCB were quantified against a standard mixture consisting of Aroclor 1242 and Aroclor 1260 in a 2.5:1 ratio. The mass fractions of total PCBs in 18 soil samples collected inside the aeroport areas ranged from 3 to 41327 ľg/kg (median 1181 ľg/kg), and those in 11 samples collected at a distance of several metres to one kilometre outside the airport fence from <1 to 39 ľg/kg (median 10 ľg/kg). Seven industrial soil samples contained 21 to 1207 ľg/kg (median 267 ľg/kg) of total PCB. In cooperation with MWC-Michael Wilken UmweltConsulting, Berlin and MPU GmbH, Dep. Analytical Laboratory, Berlin, one highly contaminated airport soil sample and two soil samples from the area of the chloro-alkali-electrolysis plant were analysed for polychlorinated dibenzo-p-dioxins (PCDD) and polychlorinated dibenzofurans (PCDF). In addition to PCDD/PCDF quantification the international toxic equivalent (I-TEQ) values of 9.7, 493 and 549 ng I-TEQ/kg d.m. were calculated for airport and two industrial soils, respectively.

PCB; PCDD; PCDF; surface soil

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