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Impact of reference geosorbents on oral bioaccessibility of PAH in a human in vitro digestive tract model

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Abstract

Former studies on human oral bioaccessibility of polycyclic aromatic hydrocarbons (PAH) from natural soil samples using human in vitro digestive tract models (physiologically based extraction tests, PBET) show highly variable results (0–100 % of mobilized PAH). Apart from other factors, the type and amount of present geosorbents are assumed to be significant for the degree of desorption/release of PAH into the digestive juice. Therefore, in this study, the reference geosorbents pure quartz sand, Na-montmorillonite clay, Pahokee peat, and charcoal “Sommerhit” were spiked with selected deuterated PAH and employed as single materials in a PBET. Lowest bioaccessibility was determined in charcoal, representing black carbon (0.1 ± 0.1 % for ∑10 PAH-d) in contrast to higher bioaccessibility in peat (6.4 ± 2.2 %) and clay (4.8 ± 1.1 %). Highest bioaccessibility was determined in sand (26.9 ± 7.5 %). The results show a systematic impact of heterogeneous geosorbents on human oral bioaccessibility of PAH and particularly black carbon acting as a very strong geosorbent that reduces human health risk.

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Acknowledgments

We kindly acknowledge Stefanie Rehrmann for initiating the PBET model setup and Dipl.-Ing. Heiner Kutza, University of Applied Sciences Osnabrück, for particle size measurements.

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Authors and Affiliations

  1. Institute of Geology and Palaeontology–Applied Geology, University of Münster, Corrensstrasse 24, 48149, Münster, Germany

    Wiebke Meyer, Sandra Kons & Christine Achten

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  1. Wiebke Meyer
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  2. Sandra Kons
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  3. Christine Achten
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Correspondence to Christine Achten.

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Responsible editor: Philippe Garrigues

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Meyer, W., Kons, S. & Achten, C. Impact of reference geosorbents on oral bioaccessibility of PAH in a human in vitro digestive tract model. Environ Sci Pollut Res 22, 5164–5170 (2015). https://doi.org/10.1007/s11356-014-3804-9

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  • DOI: https://doi.org/10.1007/s11356-014-3804-9

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