Agnieszka Dudkiewicz

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The potential impact of nanomaterials on the environment and on human health has already triggered legislation requiring labelling of products containing nanoparticles. However, so far, no validated analytical methods for the implementation of this legislation exist. This paper outlines a generic approach for the validation of methods for detection and(More)
Imaging and characterization of engineered nanoparticles (ENPs) in water, soils, sediment and food matrices is very important for research into the risks of ENPs to consumers and the environment. However, these analyses pose a significant challenge as most existing techniques require some form of sample manipulation prior to imaging and characterization,(More)
4 Agnieszka Dudkiewicz*1, 2, Stephan Wagner3, Angela Lehner4, Qasim Chaudhry1, Stéphane 5 Pietravalle1, Karen Tiede1, Alistair B.A. Boxall2, Guenter Allmaier4, Dirk Tiede5, Ringo Grombe6 6 Frank von der Kammer3, Thilo Hofman3 and Kristian Mølhave7 7 1The Food and Environment Research Agency, Sand Hutton, York Y041 1LZ, UK. 8 2The University of York,(More)
A set of four reference materials for the detection and quantification of silica nanoparticles (NPs) in food was produced as a proof of principle exercise. Neat silica suspensions were ampouled, tested for homogeneity and stability, and characterized for total silica content as well as particle diameter by dynamic light scattering (DLS), electron microscopy(More)
Available measurement methods for nanomaterials are based on very different measurement principles and hence produce different values when used on aggregated nanoparticle dispersions. This paper provides a solution for relating measurements of nanomaterials comprised of nanoparticle aggregates determined by different techniques using a uniform expression of(More)
Electron microscopy is a recognized standard tool for nanomaterial characterization, and recommended by the European Food Safety Authority for the size measurement of nanomaterials in food. Despite this, little data have been published assessing the reliability of the method, especially for size measurement of nanomaterials characterized by a broad size(More)
14 Electron microscopy is a recognized standard tool for nanomaterial characterization, and 15 recommended by the European Food Safety Authority for the size measurement of 16 nanomaterials in food. Despite this, little data have been published assessing the reliability of 17 the method, especially for size measurement of nanomaterials characterized by a(More)
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