Registration Dossier
Registration Dossier
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EC number: 920-031-1 | CAS number: -
Endpoint summary
Administrative data
Description of key information
Additional information
Acute toxicity tests to fish and daphnia as well as tests to determine the toxicity to aquatic algae have been performed with Biomass residue (liquid) obtained after B2 production according to OECD guidelines and GLP principles.
The following results were obtained:
- acute toxicity to fish: 96 -hour LC50 > 26 mg/L (measured, mean)
- acute toxicity to daphnia: 48 -hour EC50 > 27 mg/L (measured, mean)
- toxicity to aquatic algae: 72 -hour EC50 (growth rate reduction and yield inhibition) > 36 mg/L (measured, mean); NOEC (growth rate reduction and yield inhibition) = 36 mg/L
- toxicity to microorganisms: The residue was tested in a modified Sturm test up to a concentration of 92.5 mg/L based on test material. Significant break-down was observed in this study (up to 65%) form which it can be concluded that the residue does not hinder microorganisms. Furthermore, a toxicity control in this study showed more than 25% biodegradation within 14 days which also points out that the residue is not toxic to microorganisms. Given the tested concentrations being in the same range as those applied in an standard OECD study on toxicity towards activated sludge microoganisms further testing on this endpoint will not provide any additional relevant data. From this study a NOEC of 92.5 mg/L can be derived.
These results clearly indicate that Biomass residue ex B2 is not toxic to aquatic organisms among all tested trophic levels. The lowest no effect concentration, obtained from results of the short term toxicity to fish was used for the derivation of PNEC aquatic.
The substance was evaluated to be not readily biodegradable, however a biodegradation of 55% within 28 days was observed. The use as fertilzer is restricted concerning the quantity per square meter as well as the frequency (German Düngemittelverordnung) per year. A chronic exposure in the aquatic environment can therefore be excluded.
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