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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

EC50 > 1000 mg/L
NOEC = 1000 mg/L

Key value for chemical safety assessment

EC50 for microorganisms:
1 000 mg/L
EC10 or NOEC for microorganisms:
1 000 mg/L

Additional information

The study was conducted on the similar substance Reaction mass of dipotassium phosphonate and Phosphonic acid, potassium salt (1:1). Rationale for Read Across is attached at point 13.

The toxic effect on aerobic treatment plant microorganisms of the test item Potassium phosphonate (KH2PO3/K2HPO3) was tested with activated sludge after 3-hours contact. On the basis of results obtained in the preliminary test, the definitive test was carried out at five concentrations of active ingredient Potassium phosphonate in a geometric series, namely 10.0, 32.0, 100.1, 316.0 and 1000.0 mg/L. 

The EC50value and the NOEC after 3 hours of incubation, in terms of nominal active ingredient Potassium phosphonate concentrations, were greater and equal to 1000 mg/L a.i.