Registration Dossier

Ecotoxicological information

Toxicity to microorganisms

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

The 3h EC50 of bis(pentane-2,4-dionato) calcium for activated sludge in an OECD 209 test is in excess of the highest test concentration i.e. > 640 mg/L.

Key value for chemical safety assessment

EC50 for microorganisms:
640 mg/L

Additional information

One OECD 209 GLP study is available.

The toxicity of bis(pentane-2,4-dionato) calcium to activated sludge was determined at a contact time of 3 hours, using various concentrations of the test substance. The inhibitory effect of bis(pentane-2,4-dionato) calcium at a particular concentration is expressed as a percentage of the two controls.

Inhibition of the activated sludge respiration by bis(pentane-2,4-dionato) calcium does not follow a classical dose-response curve. Inhibition of the activated sludge respiration by bis(pentane-2,4-dionato) did not increase at concentrations above 80 mg/L. Respiration inhibition percentages ranged from 34% to 38% over the measured concentration range of 80 to 640 mg/L .From the results EC values could not be calculated. The EC50of bis(pentane-2,4-dionato) calcium for activated sludge after 3 hours contact time is in excess of the highest test concentration, i.e. > 640 mg/L. Bis(pentane-2,4-dionato) calcium is therefore considered not harmful to activated sludge.