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Short-term toxicity to aquatic invertebrates

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The acute toxicity of sodium percarbonate to freshwater invertebrates (Daphnia pulex) was determined in a 48 hour exposure semi-static dose-response test. The EC50 (mortality) was determined based on the titrimetrically determined concentration to be 4.9 mg/L and the NOEC to be 2 mg/L.

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The acute toxicity of sodium percarbonate to freshwater invertebrates (Daphnia pulex) was determined in a 48 hour exposure semi-static dose-response test according to TSCA guidelines (essentially equivalent to OECD No. 202) (Shurtleff 1989b). Young Daphnids (12 -24 hrs old) were exposed to a series of mean measured test concentrations 2.0, 11.8, 45.5, 88.7, 415.5 and 834.6 mg/L (ppm). Over the first 24 hours of the test the four highest concentrations decreased by 13 -30% of the originally available hydrogen peroxide; no loss at the lowest 2 concentrations was observed. Complete mortality was observed at sodium percarbonate solutions of 10 ppm and above. The EC50 (mortality) was determined based on the titrimetrically determined concentration to be 4.9 mg/L and the NOEC to be 2 mg/L.

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