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Ecotoxicological information

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In aquatic systems, butyryl chloride (CAS 141 -75 -3) hydrolyses quickly and forms HCl (CAS 7647 -01 -0) and butyric acid (CAS 107 -92 -6) (for details see section 5.1.2).

Short-term toxicity to fish

Parent compound butyryl chloride: With high probability acutely not harmful to fish (96 -h LC50 = 299 mg/L).

Hydrolysis product butyric acid: No valid data available, therefore the risk assessment is based on read-across to the structurally similar substance isobutyric acid.

Isobutyric acid: With high probability acutely not harmful to fish (96 -h LC50 = 146.6 mg/L)

Hydrolysis product HCl: Acutely toxic to fish (pH dependent; 96-h LC50 = 4.92 mg/L).

Short-term toxicity to aquatic invertebrates:

Parent compound butyryl chloride: No data available.

Hydrolysis product butyric acid: No valid data available, therefore the risk assessment is based on read-across to the structurally similar substance isobutyric acid.

Isobutyric acid: Acutely harmful to aquatic invertebrates (48 -h EC50 = 51.25 mg/L).

Hydrolysis product HCl: acutely very toxic for aquatic invertebrates (pH dependent; 48-h EC50= 0.492 mg/L).

Growth inhibition to aquatic algae:

Parent compound butyryl chloride: No data available.

Hydrolysis product butyric acid: No valid data available, therefore the risk assessment is based on read-across to the structurally similar substance isobutyric acid.

Isobutyric acid: Acutely harmful to aquatic algae and cyanobacteria (72 -h ErC50 = 53.9 mg/L).

Hydrolysis product HCl: acutely very toxic for aquatic organisms (pH dependent; 72-h ErC50= 0.492 mg/L).

Toxicity to microorganisms:

Parent compound butyryl chloride: No data available.

Hydrolysis product butyric acid: 17 -h EC10 = 39 mg/L

Hydrolysis product HCl: No data available.

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