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Aquatic toxicity data are available for fish, invertebrates, algae and cyanobacteria and micro-organisms. 

The short-term 96 -h LC50 for fish (Leuciscus idus) was > 100 mg/L (nominal concentration, pH-adjusted test solution;

BASF AG, 1988, report no. 10F0562/875273); the study also reported a 96 -h LC50 of 67.8 mg/L from the results of a series of non-pH-adjusted test solutions (nominal; geometric mean; not pH-adjusted). The mortality was significantly reduced after pH-adjustment.

The short-term EC50 for invertebrates (Daphnia magna) was 7.64 mg/L (geometric mean of three studies: BASF AG 1989; report no. 1/0021/2/89 -0021/89; APC, 2002a and 2002b, report no. RRRS EXT-02/055). Information on chronic toxicity for aquatic invertebrates was derived from the structurally similar substance DMDC (CAS 6864 -37 -5). The 21 -d NOEC for Daphnia magna was 4 mg/L (NITE, 2002).

The EC50 for aquatic algae and cyanobacteria (Desmodesmus subspicatus) was > 141.2 mg/L (BASF AG, 1990, report no. 01/89/0021). 

The EC20 for micro-organisms was 160 mg/L based on the results of a short-term respiration inhibition test with activated sludge performed with the structurally similar substance DMDC (CAS 6864 -37 -5; BASF AG, 1990; report no. 01.89/2152). 

Therefore, invertebrates (Daphnia magna) were identified as the most sensitive group of aquatic organisms. Long-term aquatic testing of fish was not indicated. The long-term NOEC of 4 mg/L for Daphnia magna was derived from the structurally similar substance DMDC (CAS 6864 -37 -5).

The chronic NOEC for Daphnia magna was the point of departure for the derivation of the PNECaquatic(freshwater)and PNECaquatic(marine water). The acute EC50 for Daphnia magna was used to calculated the PNECaquatic(intermittent releases). The EC20 for activated sludgewas the point of departure for the derivation of the PNECSTP.