Registration Dossier
Registration Dossier
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EC number: 201-170-0 | CAS number: 79-03-8
Endpoint summary
Administrative data
Description of key information
Additional information
Phototransformation in air
Parent compound propionyl chloride and hydrolysis product propionic acid: After evaporation or exposure to the air, the product will be slowly degraded by photochemical processes. This estimation refers to dry air. In mist, rain, droplets and aerosols, hydrolysis will be the major fate process of the acid chloride due to the short half-life in aqueous solution. Therefore this estimate may be of low relevance.
Hydrolysis
Parent compound propionyl chloride: In contact with water the substance will hydrolyse rapidly to propionic acid and HCl.
Hydrolysis product propionic acid: In accordance with column 2 of REACH Annex VII, the study does not need to be performed if the substance is readily biodegradable or inorganic. Propionic acid is readily biodegradable, while HCl is inorganic.
Biodegradation
As the parent compound rapidly hydrolyses in aqueous system the assessment of the biodegradability based on the hydrolysis product propionic acid, which is readily biodegradable.
Bioaccumulation
Parent compound propionyl chloride and hydrolysis product propionic acid: Significant accumulation in organisms is not to be expected.
However, the assessment of the bioaccumulation potential of the parent compound may be of low relevance due to the rapid hydrolysis of the acid chloride in aqueous solutions.
Adsorption/Desorption
Parent compound propionyl chloride and hydrolysis product propionic acid: Adsorption to solid soil phase is not expected.
However, the assessment of the adsorption potential of the parent compound may be of low relevance, due to the rapid hydrolysis of the acid chloride in aqueous solutions.
Henry’s Law Constant
Parent compound: From the water surface, the substance will slowly evaporate into the atmosphere.
Hydrolysis product: From the water surface, the substance will not evaporate into the atmosphere.
However, the assessment of the volatility of the parent compound may be of low relevance due to the rapid hydrolysis of the acid chloride in aqueous solutions.
Distribution modelling
Parent compound propionyl chloride: Over time the substance will preferentially distribute into the compartments air (66%) and water (34%).
However, the model calculation may be of low relevance as the compound rapidly decomposes in water (t1/2 << 24 h).
Hydrolysis product propionic acid: Over time the substance will preferentially distribute into the compartment water (98.8%). However, as the model does not consider the ionic character of the molecule at environmental relevant pH conditions, the distribution into water may be underestimated by the model.
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