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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

No reliable study with single superphosphate is present. Based on a reliable study with ammonium dihydrogenorthophosphaten the LC50 for freshwater fish (rainbow trout) is > 85.9 mg/L.

Key value for chemical safety assessment

LC50 for freshwater fish:
85.9 mg/L

Additional information

No reliable study with single superphosphate is present although one in present from the phosphate category. However, in a reliable OECD 203 guideline study, rainbow trout were exposed for 96 hr under static conditions to 6.25, 12.5, 25.0, 50.0, and 100 mg/L ammonium dihydrogenorthophosphate. Measured concentrations were determined to be 5.72, 11.9, 23.5, 46.6 and 85.9 mg/L (mean of t=0 and 96 h; 86 to 95% of nominal concentration). Based on mean calculated total substance concentrations in test water, the 96-hour LC50 value was determined to be >85.9 mg/L (>100 mg/L nominal), the highest treatment concentration of the definitive test. The 96-hour NOEC was 85.9 mg/L, based on the absence of any mortality and sublethal effects at this and all lower treatment concentrations. The slope of the 96-hour dose-response line could not be calculated due to the absence of mortality.