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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Administrative data

Link to relevant study record(s)

Description of key information

Parent compound: no data available
Hydrolysis product: Acutely harmful to aquatic aclae.

Key value for chemical safety assessment

EC50 for freshwater algae:
53.9 mg/L

Additional information

Parent compound isobutyryl chloride:

No data are available for the test substance isobutyryl chloride (CAS 79 -30 -1). The substance rapidly decomposes in water and forms HCl (CAS 7647 -01 -0) and isobutyric acid (CAS 79 -31 -2). Therefore, the short-term toxicity to algae is assessed on the basis of data on isobutyric acid.

The toxicity of isobutyric acid was tested to the test organism Scenedesmus subspicatus according to German Industrial Standard Guideline DIN 38412 part 9. The 72 -h ErC50 was determined to be 53.9 mg/L [(nominal, not neutralized) BASF 1999 2/0244/89]. Based on the results of the read across substance isobutyric acid, the test substance isobutyryl chloride is supposed to be acutely harmful to aquatic algae.

Hydrolysis product hydrochloric acid (HCl):

The hydrolysis product hydrochloric acid (HCl) was tested in an algae growth inhibition test according to OECD 201 with Pseudokirchneriella subcapitata. The 72-h ErC50 was 0.492 mg/L (acid equivalent to pH 5.3), the 72 -h NOEC was 0.097 (acid equivalent to pH 6; OECD 2002).