Organic substances that are persistent, bioaccumulative and possess toxic characteristics likely to cause adverse human health or environmental effects are called PBTs (Persistent, Bioaccumulative, Toxic substances). In this context, “substance” means a single chemical species, or a number of chemical species which form a specific group by virtue of (a) having similar properties and being emitted together into the environment or (b) forming a mixture normally marketed as a single product. Depending on their mobility in the environment, PBTs could be of local, regional or global concern (Wallack et al., 1998).
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Systemische Notwendigkeit zur Weiterentwicklung von Hybridnetzen