FDTD Simulation set up was rearranged in order to obtian optimal simualtion conditions. Simualtion of low index materials like silver reiured very fine mesh and careful parameter adjustement. It was done by convergence testing and camparison of simulated and theoretical results of extinction cross section of Johnsnon and Cristy model. Next conidtions were veryfied for other models of silver. The most appropriate model was defined by adusting extinction plot with measured absrobance curve of actual suspension. Palik model seemed to provide the best match. It was used for further investigations.

Model suspension of 100 nm higly neagative particles was used to study the influance of PAH adsorption. The optimal conditions of ionic strength of 0,15 and pH 7 were found.