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The occurrence and levels of organochlorine pesticides and polychlorinated biphenyls (PCB) were determined in herring, sprat and salmon from the southern Baltic Sea, collected in the period 2006-2009. The determinations of HCH isomers (alpha-, beta- and gamma-HCH), HCB, ∑-DDT (p,p’-DDT, o,p’-DDT, p,p’-DDE and p,p’-DDD) and ∑-PCB (seven indicator PCB congeners 28, 52, 101, 118, 138, 153 and 180) were carried out using capillary gas chromatography. The mean concentrations of ∑-DDT expressed on whole weight basis ranged from 25.7 µg/kg (herring) to 64.4 µg/kg (salmon), and for ∑-PCB from 15 µg/kg (herring) to 39.4 µg/kg (salmon). The levels of ∑-DDT and ∑-PCB were about 2.5-fold higher in the muscle of salmon than in muscle of other fish species. The mean contribution of p,p’-DDE to the sum of DDT and PCB 153 and PCB 138 to the sum of PCB exceeded 60% in all fish samples studied. No differences in contamination levels among the years of study were observed.
Food products of animal origin are the primary source of human exposure to persistent organic compounds such as polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs) and polychlorinated biphenyls (PCBs), including dioxin-like PCBs (dl-PCBs) and non-dioxin-like PCBs (ndl-PCBs). For about two decades it has been known that some production systems may be responsible for elevated levels of these contaminants in eggs. This paper presents the results of the official survey of PCDD/Fs and PCBs in eggs carried out in the years 2006-2014 and describes the sources of contamination in cases exceeding the maximum permitted levels. Furthermore, the risk assessment of exposure for various groups of consumers was conducted. The contaminants were found in the eggs from all bird species (hens, quails, ducks, and geese). Generally, the levels of PCDD/Fs and dl-PCBs in eggs were low and did not exceed the permitted limit (set only for hen eggs). However, in the case of eggs from free-ranging hens, contents of the toxic compounds were significantly higher. In addition, 10% of these egg samples exceeded the maximum permitted levels. With the exception of one sample, the levels of ndl-PCBs were much lower than the levels set by EU legislation. Examination of feed from farms with non-compliant results did not show increased concentrations of dioxins, furans and dl-PCBs. In five cases, soil was the source of contamination (in one case, in addition to soil, also vegetation and crushed building materials on the farm). The sources of contamination were proven with the correspondence of congener profiles. However, in some instances the source of contamination remained unknown. All through risk assessment, long-term consumption of free range eggs with increased content of dioxins, furans and dl-PCBs may lead to the unacceptable exposure to these contaminants, especially for children. Sometimes, the estimated intake stood even higher than the toxicological reference value. Minimizing the risk associated with human exposure to persistent organic pollutants is an important element of the policy on improving public health. Due to the ability of dioxins and PCBs to accumulate in the food chain, at the end of which there are humans, constant monitoring of food is advised. In the case of eggs, particular attention should be paid to those obtained from free-ranging hens.
Определено содержание шестихлорбензола (НСВ), α-, β-, γ-, δ-шестихлорциклогексана (НСН, ВНС), р,р' — DDE, о,р' — DDD, р,р' DDD, о.р' — DDT и р,р' — DDT (ΣDDT), а также полихлорны дифенилов (PCBs) в мышцах и печенни трески, шпрот, сельди, камбалы и бельдюг, изловленных в южной части Балтики, а также в мышцах угрей из озер Быдгощского воеводства. Ни в одной из проб не отмечено наличия δ-НСН, о,р' — DDD и о,р' — DDT. Уровень НСВ и ΣНСН в мышцах исследованных рыб сравниваем с тем, который отмечено у рыб, изловленных в ~ 1968—1983 гг. В случае угрей из озер Быдгощского воеводства обнаруживалось относительно больше изомера γ-НСН. В общем, балтийские рыбы, изловленные в 1985—1986 гг., содержали в мышечной ткани 2-кратно высший уровень ΣDDT чем отмечалось в 1981—1983 гг. Угри из озер Быдгощского воеводства содержали в мышцах значительно меньше PCBs чем балтийские рыбы. Уровень остатков НСВ, ΣНСН, ΣDDT и PCBs в мышцах балтийских рыб был ниже применяемой толерантности а в случае угрей у некоторых экземпляров уровень ΣНСН превышал величину 200 мг/кг.
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