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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Hydrolysis product valeric acid: Acutely harmful to algae.

Hydrolysis product HCl: Acutely very toxic for aquatic organisms (pH dependent).

Key value for chemical safety assessment

EC50 for freshwater algae:
31.3 mg/L

Additional information

Parent compound valeryl chloride (CAS 638 -29 -9):

No data are available for valeryl chloride (CAS 638 -29 -9). The substance rapidly decomposes in water and forms HCl (CAS 7647 -01 -0) and valeric acid (CAS 109 -52 -4). Therefore, the short-term toxicity to algae is assessed on the basis of data on valeric acid.

Hydrolysis product valeric acid (CAS 109 -52 -4):

No experimental data are available for the hydrolysis product valeric acid. Therefore, a read-across analysis was performed with QSAR Toolbox v4.4. The 72 -h EC50 was determined to be 31.3 mg/L (BASF SE, 2020).

Valeric acid is therefore considered to be acutely harmful to algae.

Hydrolysis product hydrochloric acid (HCl; CAS 7647 -01 -0):

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).