The test guideline now provides a standardised method for determining the dispersion stability of nanomaterials in aqueous media as a function of environmental conditions. The need for such a test guideline for the environmental risk assessment of nanomaterials is based on recommendations from OECD-experts. This is because dispersion stability influences the mobility and availability of nanomaterials in the environment. Until now, there was no OECD test guideline to describe this property. The data that can now be collected on the basis of this test guideline thus serve as an essential basis for further testing strategies on the environmental behaviour and exposure of nanomaterials.
Important REACH amendment
In addition to the solubility rate, dispersion stability in aqueous media is a fundamental parameter that should be taken into account in the context of proper regulation of nanomaterials. Thus, in the discussions on the nanospecific adaptation of the European Chemicals Regulation, Germany calls for REACHto include this as a request for information.
The OECD Test Guidelines for the Testing of Chemicals comprise a set of standardised, internationally harmonised and accepted test methods and guidance documents that can be used to characterise chemicals and to investigate their potentially harmful behaviour and effects on humans and the environment. These test guidelines have been developed primarily for water-soluble organic chemicals. However, the behaviour of nanomaterials in the environment and in humans differs significantly from that of these chemicals, so that although it is recognised that the existing OECD test guidelines are generally also applicable to nanomaterials, there is nevertheless a need for adaptation and supplementation.
The test guideline now adopted was developed by the Department of Environmental Geosciences at the University of Vienna on behalf of the Federal Environment Agency and with the support of the Federal Ministry for the Environment, Nature Conservation, Building and Nuclear Safety.
Further information:
The development of the test guideline at the University of Vienna was summarized in a comprehensive research report. The research report in English language will be available after completion on the UBA-pages on nanotechnology will be available.
