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    Oral bioaccessibility of silver nanoparticles and ions in natural soils: Importance of soil properties.

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    Authors
    Dang, Fei
    Jiang, Yuanyuan
    Li, Min
    Zhong, Huan
    Peijnenburg, WillieJ G M
    Shi, Weilin
    Zhou, Dongmei
    Type
    Article
    Language
    en
    
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    Title
    Oral bioaccessibility of silver nanoparticles and ions in natural soils: Importance of soil properties.
    Published in
    Environ Pollut 2018; 243:364-373
    Publiekssamenvatting
    The abundance of silver nanoparticles (AgNPs) in consumer products has led to their environmental release and therefore to concern about their impact on human health. The ingestion of AgNP-contaminated soil from urban sites is an important exposure pathway, especially for children. Given the limited information on oral bioaccessibility of soil Ag, we used a physiologically based extraction test (PBET) to evaluate the bioaccessibility of AgNPs and AgNO3 from soil digestion. The AgNPs underwent several biochemical transformations, including their simultaneous dissolution and agglomeration in gastric fluid followed by the disintegration in the intestinal fluid of the agglomerates into NPs containing silver and chlorine. Therefore, Ag-containing soil exposed the intestine to nanoparticulate Ag in forms that were structurally different from the original forms. The bioaccessibility of AgNPs (0.5 ± 0.05%-10.9 ± 0.7%) was significantly lower than that of AgNO3 (4.7 ± 0.6%-14.4 ± 0.1%), as a result of the lower adsorption of nanoparticles to soil residues during the digestive process. For the soils tested, the bioaccessibility of AgNPs increased with decreasing clay contents and lower pH. By identifying the soil properties that control AgNP bioaccessibility, a more efficient and accurate screening can be performed of soil types that pose the greatest health risk associated with AgNP exposure.
    DOI
    10.1016/j.envpol.2018.08.092
    PMID
    30199811
    URI
    http://hdl.handle.net/10029/622200
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.envpol.2018.08.092
    Scopus Count
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    Miscellaneous

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