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Toxicity to microorganisms

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Description of key information

The PNECstp for hydrogen peroxide can be derived from the EC50 value and is 4.66 mg/L. Taking into account the hydrogen peroxide content of sodium percarbonate (28.7 %), the corresponding PNECstp for sodium percarbonate is 16.24 mg/L.

Key value for chemical safety assessment

Additional information

Sodium percarbonate rapidly dissolves in water and dissociates to sodium, carbonate and hydrogen peroxide. The latter substance may be considered to be the most critical one regarding its toxicity to aquatic microorganisms. The European Union Risk Assessment Report on hydrogen peroxide has reviewed the toxicity to aquatic microorganisms of hydrogen peroxide (European Commission 2003). They refer to a study on activated sludge that has been conducted according to OECD guideline 209 and in compliance with GLP testing over a nominal concentration range of 1 to 1000 mg/L. The hydrogen peroxide inhibited the respiration of activated sludge in a concentration dependent manner. The effect was reversible with time due to the rapid degradation of hydrogen peroxide mediated by the biological matrix. The EC50 value was 466 mg/L. Aqueous solutions of hydrogen peroxide have been notified as biocidal products under the EU Biocidal Products Directive 98/8/EC for the product categories PT 1-6 and PT 11 and 12.

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