TRENDS OF PCBs CONTENT IN SOILS IN IMPACT ZONE OF PAINT AND VARNISH MANUFACTURE (ON AN EXAMPLE OF LIDA CITY, BELARUS)

Technical mixtures based on PCBs (Sovol plasticizer) were used for the more than 30 years for paint and varnish manufacture in Lida city (Grodno region, Belarus). Soils on the territory of enterprises and adjacent area have been contaminated as a result of Sovol leakages as well as releases of waste water and solid waste. Investigations of PCBs content in soil have been fulfilled in the period from 2004 to 2014. PCB congeners (PCB-28, PCB-52, PCB-101, PCB-118, PCB-153, PCB-138 and PCB-180) in soil samples were detected by gas chromatography with ECD and chromatography mass spectrometry. Since the start of investigation, PCBs content in soil has been decreased with the rate of about 2 mg / kg, or 9 %, per year. Despite the almost 20-year period after Sovol was banned, the industrial area is still contaminated and the residual concentrations of PCBs are higher in dozens and hundreds times than maximum permissible level. The similarity of the PCB congeners profiles in the soils of the industrial site and the adjacent area, especially in the runoff area, indicates the redistribution of PCBs with runoff and the formation of secondary pollution site.

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