Article Details: Received: 2020-09-07 | Accepted: 2020-10-19 | Available online: 2020-12-31

https://doi.org/10.15414/afz.2020.23.04.241-247

The contents of polychlorinated biphenyls (PCBs) were determined in raw cow’s milk, feed and soil samples from three regions of Slovak Republic (SR) depending on the environmental regional classification of SR. Total 60 pool milk samples from undisturbed environment (Novoť area), moderately disturbed environment (Tulčík area), and from strongly disturbed environment (Čečejovce area) collected in April, July and September were extracted, purified by gel permeation chromatography (GPC) and analyzed using the gas chromatography with electron capture detector method (GC-ECD). Thirty feed samples of total mixed ration (TMR) were collected in April and September and after the extraction and purification by GPC were analyzed using gas and liquid chromatography (GLC). Fifteen soil samples collected in April were analyzed using the GC-ECD. All samples of raw milk, feed and soil were under the limit of quantification (LOQ) from all regions and did not exceed the limits set by European Commission. There were no seasonal differences in the PCBs levels in the milk, feed and soil samples. The milk PCBs consumption from these locations has no negative impact on consumer’s health. The results indicate the decreasing trend in PCBs occurrence in the environment and food sources. Despite this positive findings, there is a constant need to monitor environmental burden of PCBs in the different regions of Slovakia where mainly food of animal origin is produced and to recognize another sources of PCBs that may impact the food chain.

Keywords: polychlorinated biphenyls, PCB, cow milk, cows, Slovakia

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