Registration Dossier
Registration Dossier
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EC number: 212-783-8 | CAS number: 868-85-9
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
EC50 nominal (72 h) = 100 mg/L for Desmodesmus subspicatus (EU Method C.3 of directive 92/69/EEC)
Key value for chemical safety assessment
Additional information
In a limit test according to Directive 92/69/EEC, C.3, with analytical monitoring, no toxic effect on growth rate of Desmodesmus subspicatus could be observed, thus the 72 h-EC50 (nominal) was = 100 mg/L (Bayer, 2003). Presumably due to pH and presence of catalytic ions, dimethyl phosphonate was hydrolysed completely to monomethyl phosphonate within about 0.5 h during the preparation of the test solutions. Monomethyl phosphonate remained stable during the test for 72 h, the geometric mean of the measured monomethyl phosphonate concentrations being 26 mg/L. DOC measurements confirmed the presence of virtually all organic carbon of the initial carbon content of dimethyl phosphonate.
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