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The short-term aquatic toxicity of sodium percarbonate has been tested in a valid semi-static study using freshwater fish (Pimephales promelas, Shurtleff 1989a). Test solutions were renewed daily and the hydrogen peroxide concentration was determined before and after renewal using a titration with potassium permanganate. The measured hydrogen peroxide concentration was used to calculate mean measured sodium percarbonate concentrations. Fish were exposed for 96 hours to mean measured sodium percarbonate concentrations of 0, 1.1, 7.4, 34, 81, 465 and 937 mg/L and observations were made after 24, 48, 72 and 96 hours. The LC50 and NOEC (No Observed Effect Concentration, based on mortality) of sodium percarbonate were 71 and 7.4 mg/L, respectively. No control mortality was observed.

The effects of short-term exposure to sodium percarbonate on the water flea Daphnia pulex have been studied by Shurtleff (1989b) according to EPA guidelines. Daphnids were exposed for 48 hours and they were transferred to fresh test solutions daily. The hydrogen peroxide concentrations were measured before and after each renewal using a titration with potassium permanganate. The measured hydrogen peroxide concentration was used to derive mean measured sodium percarbonate concentrations. Mean measured test concentrations were 0, 2.0, 12, 46, 89, 416 and 835 mg/L. Based on mortality the EC50 and NOEC of sodium percarbonate were 4.9 and 2.0 mg/L, respectively. No control mortality was observed.

No long-term aquatic toxicity tests have been carried out with sodium percarbonate due to its low stability in water. However, from the available ecotoxicological information it becomes evident that the aquatic toxicity of sodium percarbonate can be predicted on the basis of the chronic toxicity of hydrogen peroxide and sodium carbonate.

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