Nanomaterials are nowadays used in increasing amounts in everyday products and special applications. Enhanced release of engineered nanomaterials (ENM) into the environment can hence be assumed. The first part of the study dealt with a method development for the stability testing of the coating of two different functionalised TiO2 nanomaterials. The stability was analysed covering different environmental conditions like pH, ionic strength and dissolved organic carbon concentration. The second part of this study analysed the carrier function of P25 for the two different substances, copper and 14C triclocarban, in three different soil types.