Reihung gewaesserrelevanter, gefaehrlicher Stoffe aufgrund ihrer Exposition und Wirkung fuer 1993/94. (Priority ranking of substances hazardous to the aquatic system according to their exposure and effects for 1993/94)
(Englisch)
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For the identification of substances occuring in surface waters and being hazardous to the aquatic ecosystem a tiered selection scheme has been developed and applied in a previous project (Application of a selection scheme for the identification of substances hazardous to the acquatic system, No.: 102 04 109). On the first tier, substances occuring in surface waters were identified by comparison with substances in international lists (such as lists I and II of the Directive 76 464 EEC and annex 1A and 1D of the 3. International North Sea Conference). For substances which are detected in monitoring programs but are not listed in the international lists as well as for substances which are detected in monitoring programs but are not listed in the above lists, the second tier was applied. That comprised a substance ranking according to their hazard for aquatic organisms using a scoring system. For the exposure assessment monitored concentrations are used in order to avoid false positive or negative results. For the effect assessment the respective part of the IPS-system (developed within the EU for the ranking of Existing Chemicals) was used. Direct and indirect effects (bioaccumulation) are considered. On the third tier a source identification was performed identifying point and diffuse sources. Within the framework of the actual project an actualisation of the above feasibility study was performed: monitoring data were taken from 1993 and 1994; additionally, data from the North Sea as well as sediment data were considered. The software was improved in order to enable an easy calculation and assessment of the different results (e.g. use of mean or median values as input for the second tier, differentiation according to various streams; consideration of the statement 'not detectable'). The software programme also enables a further implementation of actual data in the near future. (orig.)
Reihung gewaesserrelevanter, gefaehrlicher Stoffe aufgrund ihrer Exposition und Wirkung fuer 1993/94. (Priority ranking of substances hazardous to the aquatic system according to their exposure and effects for 1993/94)