Evaluation of Bioassays and Wastewater Quality ... - Oekotoxzentrum

9. Appendix
Appendix for chapter 5
Derivation of water quality criteria
The quality criteria for the prioritized substances were derived from ecotoxicological effect data
as shown in Figure 9.
Figure 9: Steps of the development of an EQS-proposal at the Swiss Centre for Applied
Ecotoxicology (Kase et al., 2011).
For substances for which EQS exist or existed in EU countries, only an assessment of the
appropriateness of the EQS is made with respect to current ecotoxicity data. For substances for
which EQS are developed at the same time in the EU and in Switzerland, the EQS are derived in
close collaboration with the appropriate experts. All effect data which were not assessed for their
quality by other institutions before are assessed for their validity (Klimisch et al., 1997;
Matthiessen et al., 2009) and relevance. The proposals put forward are still provisional and will
undergo a further phase before they are finalized.
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