Chickens’ eggs and the livers of farm animals as sources of perfluoroalkyl substances

Mikołajczyk, Szczepan; Warenik-Bany, Małgorzata; Pajurek, Marek

doi:10.2478/jvetres-2024-0034

Abstract

Introduction

This study focuses on perfluoroalkyl substance (PFAS) content in chickens’ eggs and the livers of farm animals.

Material and Methods

Chickens’ eggs (n = 25) and the livers of cows (n = 10), chickens (n = 7) and horses (n = 3) were collected from various regions of Poland. Samples were analysed using the isotope dilution technique with liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS).

Results

The mean lower bound (LB) sum of four PFAS (∑4 PFAS) concentrations (perfluorooctanesulfonic acid (PFOS), perfluorooctanoic acid (PFOA), perfluorononanoic acid (PFNA) and perfluorohexanesulfonic acid (PFHxS)) were the highest in cows’ livers (0.52 μg/kg) and much lower in chickens’ (0.17 μg/kg) and horses’ livers (0.13 μg/kg) and chickens’ eggs (0.096 μg/kg). The ratio of ∑4 PFASs to the limits set by Commission Regulation (EU) 2023/915 was <7% for liver and <6% for eggs. Linear PFOS was the compound with the highest detection frequency (8% in eggs and 48% in all livers). In cows’ livers it was detected in 80% of samples. The estimated exposure to LB ∑4 PFASs via consumption of liver tissue from farm animals (assuming 50 g and 100 g portions) was <52% of the tolerable weekly intake (TWI) for children and <17% of the TWI for adults. Dietary intake via the average portion of three eggs led to low exposure of <15% for children and <5% for adults.

Conclusion

Neither eggs nor the livers of chickens or horses as analysed in this study are significant sources of PFASs, while cows’ livers might contribute significantly to a child’s overall dietary intake. Further investigation of PFOS in farm animal livers should be conducted.

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