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Short-term toxicity to fish

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In an acute toxicity test, freshwater fish (Pimephales promelas) were exposed to the test substance sodium percarbonate for 96 hours under semi-static conditions (Shurtleff 1989a). By 24 hours, the fish having survived the 80.5 mg/L exposure began to manifest various symptoms of intoxication. The 96 -hour LC50 based on mortality was calculated to be 70.7 mg/L (with a 95% confidence interval of 49.9 to 100.2 mg/L).

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In an acute toxicity test, freshwater fish (Pimephales promelas) were exposed to the test substance sodium percarbonate for 96 hours under semi-static conditions (Shurtleff 1989a). The test was conducted in accordance with EPA guidelines. The nominal concentrations were 0, 1, 10, 50, 100 and 1000 mg/L. The test medium was exchanged every 24 hours. The average concentrations measured by determining titrimetrically the hydrogen peroxide concentrations of the test solutions were 0, 1.1, 7.4, 33.5, 80.5, 465 and 937 mg/L. The fish were affected within minutes when exposed to 33.5 mg/L of sodium percarbonate and above. Fish exposed to 465 and 937 mg/L showed the most severe symptoms: all test animals died within 12 hours. By 24 hours, the fish having survived the 80.5 mg/L exposure began to manifest various symptoms of intoxication. The 96 -hour LC50 based on mortality was calculated to be 70.7 mg/L (with a 95% confidence interval of 49.9 to 100.2 mg/L). The NOEC (No Observed Effect Concentration, based on mortality) of sodium percarbonate was 7.4 mg/L.