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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

Under pH adjusted conditions no inhibition of algal growth was observed at a nominal concentration of 100 mg/L

Key value for chemical safety assessment

EC10 or NOEC for freshwater algae:
100 mg/L

Additional information

A 72 hour algal study (conducted according to EU Method C.3 (Algal Inhibition test)) was conducted exposing phosphorus trichloride to Desmodesmus subspicatus. The results of the study are based on nominal exposure concentrations and on test media without pH adjustment. The 72 hour EbC50was 30.24 mg/L (95% confidence limits of 29.99 to 30.49 mg/L), the 72 hour ErC50was 33.41 mg/L (95% confidence limits of 33.25 to 33.57 mg/L) and the overall NOEC was 12.5 mg/L. Under pH adjusted conditions no inhibition of algal growth has been observed at a nominal concentration of 100 mg/L. Analytical determination of test substance concentration was not practical due to its rapid reaction with water and subsequent degradation.