Registration Dossier

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Key value for chemical safety assessment

Additional information

There is no aquatic algae toxicity test for "Reaction products of 3-methylbutanal and 3-methylbut-3-en-1-ol, distillation overheads, acid-treated, hydrogenated" available. Thus, the hazard assessment is based on both main components of the Reaction products. For 2H-Pyran, tetrahydro-4-methyl-2-(2-methylpropyl)- (CAS 13477-62-8; 30-80% of the Reaction product) a study of a analog substance (CAS 16409-43-1) has been used. The toxicity of this analog towards Pseudokirchneriella subcapitata was investigated according to OECD Guideline 201 under GLP conditions (BASF 2013). The calculated 72h-EC50 was 79.7 mg/l (nominal).

The toxicity of the second main component 2H-pyran-4 -ol (CAS 63500-71-0; 10 -60% of reaction product) to algae was determined in a guideline study in compliance with OECD guideline 201. The growth rate of the algae species Desmodesmus subspicatus was investigated. At test termination after 72 hours an EC50 >94 mg/l was detected (Unilever Reserach UK, 1996).

Based on the assessment of both main components, the toxicity to aquatic algae of "Reaction products of 3-methylbutanal and 3-methylbut-3-en-1-ol, distillation overheads, acid-treated, hydrogenated" is considered to be 79.7 mg/L as a worst-case assumption.