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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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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).