Calibration of silicone rubber - determination of diffusion and water/partitioning coefficients for organic UV filters

PRESENTER: Mr Rory Verhagen (Masters of Toxicology and Environmental Health Candidate, IRAS Institute, University of Utrecht, The Netherlands)

ABSTRACT: As an emerging contaminant, organic UV filters have received considerable attention in recent years, due to their widespread-presence and possibility to act as endocrine disrupting compounds.  For environmental risk assessment, it is important to know the freely dissolved concentration of chemicals. This knowledge is needed to estimate the distribution between biota, and the bio accumulating properties.   A useful tool to measure freely dissolved chemicals are passive samplers. Furthermore, they provide time-weighted average results for periods of a few weeks up to a couple of months.  Before application of passive samplers, chemical-sampler specific coefficients must be estimated. The polymer-water partition coefficients (KPW) and diffusion coefficients (Dp) play a key role in the calculation for freely dissolved chemicals.

Aim of my internship: to estimate the Partitioning and Diffusion coefficient