Registration Dossier

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

An algal growth inhibition study according to OECD guideline 201/EU C.3 was conducted. The NOELR (WAF) value of di(2-ethylhexyl) peroxydicarbonate for Pseudokirchneriella subcapitata based on growth rate is ≥ 100 mg/L (nominal) which corresponds to a measured NOEC of the degradation product 2-ethylhexan-1-ol of 7.26 mg/L.

Key value for chemical safety assessment

EC10 or NOEC for freshwater algae:
7.26 mg/L

Additional information

In a 72 hour toxicity study, cultures of Pseudokirchneriella subcapitata were exposed to bis(2-ethylhexyl) peroxydicarbonate at nominal concentrations of 0 and 100 mg/L in a limit test under static conditions in accordance with OECD 201/EU C.3. The test item is a mixture of 2 constituents with different solubility and physicochemical properties. Test solutions were prepared according to the WAF methodology (water accommodated fraction).

Concentrations of the test item were measured by GC-MS. The parent substance was quantified via its degradation product 2-ethylhexan-1-ol. The final concentrations of the test item were within 80 % of initial.

The NOELR (WAF) value based on growth rate is ≥ 100 mg/L (nominal) which corresponds to a measured concentration of 7.26 mg/L.

Remark: The test was done following the WAF procedure (since the test item contains 25 % isododecane). Measurements were made for the degradation product 2-ethylhexan-1-ol by GC-MS. Isododecane is stated to be practically insoluble in water (no exact values available). The water solubility of the degradation product 2-ethylhexan-1-ol is much higher compared to isododecane. However, isododecane may contribute to the overall toxicity observed in the test. Therefore, the test can be regarded as a worst-case that can be used in the assessment of the pure peroxide substance itself (which is, however, not stable without the additive).