PCDDs, PCDFs, dioxin-like PCBs and indicator PCBs in soil from five selected areas in Slovakia

Area of Science:

• Environmental Chemistry
• Pollutant Analysis
• Soil Contamination

Background:

• Limited data exists on persistent organic pollutants (POPs) in Slovakian soils.
• Industrial activities are potential sources of POPs, necessitating environmental monitoring.
• Understanding POP distribution is crucial for assessing ecological and human health risks.

Purpose of the Study:

• To quantify concentrations of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), dioxin-like polychlorinated biphenyls (dl-PCBs), and indicator PCBs in Slovakian soils.
• To assess POP levels in soils near industrial sources and compare them to a background area.
• To identify the predominant POP congeners and major contributors to toxic equivalents (TEQ).

Main Methods:

• Collection of 32 soil samples from areas near four industrial sources and one background site in Slovakia in 2007.
• Analysis of 17 PCDD/F congeners, 12 dl-PCB congeners, and 6 indicator PCBs.
• Calculation of total toxic equivalents (TEQ) using WHO (1998) guidelines.

Main Results:

• Total WHO(1998)-PCDD/F/dl-PCB-TEQ concentrations ranged from 0.34 to 18.05 pg g(-1) dry weight.
• Average TEQ concentrations varied by site, with Krompachy showing the highest average (7.80 pg g(-1) dw).
• OCDD, PCB 118, and PCB 153 were the predominant contaminants for PCDD/Fs, dl-PCBs, and indicator PCBs, respectively.

Conclusions:

• POPs, including PCDD/Fs and PCBs, are present in Slovakian soils near industrial areas.
• Specific congeners like 2,3,4,7,8-PeCDF and PCB 126 were major contributors to the overall TEQ.
• Further research is needed to understand the long-term fate and impact of these POPs in the Slovakian environment.