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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Toxicity to microorganisms

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Administrative data

Link to relevant study record(s)

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.