Registration Dossier
Registration Dossier
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EC number: 243-001-3 | CAS number: 19372-44-2
Toxicity to microorganisms
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.
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