Freitag, 29. November 2013, 15:15 - 16:45 iCal
Nanoparticle Analysis in Products and Environment
Vortrag von Dr. Frank von der Kammer (Universität Wien, Department für Umweltgeowissenschaften)
Seminarraum 2124 der Fakultät für Chemie, 1. Stock
Währinger Straße 42, 1090 Wien
Seminar, Workshop, Kurs
The analysis of engineered nanoparticles (ENPs) in consumer products, food and the environment is still a challenging task. Advances in the study of the fate, transport, and (eco-) toxicological effects of ENPs are hampered by a lack of adequate techniques for the detection and quantification at relevant concentrations and in samples with a complex composition. The analysis of ENPs differs from traditional chemical analysis because both chemical and physical forms must be considered. Since ENPs are colloidal systems, their appearance and physicochemical properties depend upon the surrounding conditions and may be of transient character. The consequence is that by trying to observe, isolate, and quantify ENPs, their physicochemical properties may be changed, making the analysis extremely susceptible to artifacts. Frequently the direct and noninvasive detection of ENPs in complex samples is hampered by the presence of sample components interacting with the NPs and/or interfering with the analytical technique. Separation and isolation of the ENPs is therefore necessary in most cases. Field-flow fractionation and single-particle inductively coupled plasma mass spectrometry (ICP-MS) based techniques have made considerable progress because of their particle size and compositional selectivity.
The presentation will provide conceptual approaches to the problem, cover examples of particle/matrix combinations and discuss the pro and cons of the different methodological approaches. It will also address the challenges posed to analytical methods arising from the recommendation for a definition of nanomaterials issued by the EU commission.
Veranstalter
Institut für Physikalische Chemie, Universität Wien
Kontakt
Univ.-Prof. Dr. Wolfgang Kautek
Universität Wien
Institut für Physikalische Chemie
01 4277 52470
wolfgang.kautek@univie.ac.at
Erstellt am Freitag, 27. September 2013, 18:54
Letzte Änderung am Montag, 25. November 2013, 12:38