Registration Dossier

Ecotoxicological information

Short-term toxicity to aquatic invertebrates

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

The 48 hour EC50 value was 3.84 mg/l (95% confidence limits of 3.01 and 4.80 mg/l; measured concentration).
After 48 hours, the lowest measured concentration resulting in 100% immobility was 6.63 mg/l and the highest measured concentration at which immobilisation was </= 10% was 1.74 mg/l (NOEC).

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
3.84 mg/L

Additional information

One reliable proprietary freshwater study, Huntingdon (2004b) is available for the isomer 2-methylbut-2-ene (CAS 513-35-9). Since isoamylene (2-methylbutene, CAS 26760-64-5) is a mixture of the two isomers, 2-methylbut-2-ene (CAS 513-35-9) and 2-methylbut-1-ene (CAS 563-46-2) and in the absence of any reliable data for isoamylene the data for the isomer (CAS 513-35-9) are considered suitable for read-across.

The 48 hour EC50 value was 3.84 mg/l (95% confidence limits of 3.01 and 4.80 mg/l; measured concentration). After 48 hours, the lowest measured concentration resulting in 100% immobility was 6.63 mg/l and the highest measured concentration at which immobilisation was </= 10% was 1.74 mg/l (NOEC).