Mar 9 – 11, 2015
NH Laguna Palace Hotel
Europe/Rome timezone

Implications of using inappropriate fate descriptors for engineered nanoparticles

Mar 9, 2015, 6:10 PM
20m
Breakout 2 (NH Laguna Palace Hotel)

Breakout 2

NH Laguna Palace Hotel

Viale Ancona, n° 2 30172 Venice-Mestre, Italy Tel: +39 041 829 6111 Fax: +39 848 390 230
Parallel session 2B: Environmental exposure, release & fate 2B Environmental exposure, release & fate

Speaker

Antonia Praetorius (University of Vienna)

Description

There has been a lot of debate in recent years regarding appropriate fate descriptors for engineered nanoparticles (ENPs), needed to predict ENP concentrations and transport in different environmental compartments. It is tempting to simply apply concepts for conventional organic pollutants, such as the use of equilibrium partition coefficients (e.g. Kow, Kd) in fate and risk assessment of ENPs. However, due to their fundamentally different properties compared to organic chemicals, equilibrium partition coefficients lack a fundamental physical definition for ENPs and a fate assessment based on such coefficients is essentially meaningless. Here we present a few short case studies to demonstrate the implications of using any sort of ill-defined distribution coefficient in fate predictions for ENPs. We demonstrate the results of using operationally defined partition coefficients in different types of model preditions to exemplify why such coefficients cannot be used in the same universal manner as equilibrium partition coefficients are used in fate models for organic contaminants. Currently, model validations with field measurements of ENP concentrations in complex environmental matrices are not yet feasible, making it particularly important to carefully design environmental fate models for ENPs based on a strong theoretical understanding of the underlying processes to avoid making meaningless model predictions.

Primary author

Antonia Praetorius (University of Vienna)

Co-author

Frank von der Kammer (University of Vienna)

Presentation materials