Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Phototransformation in air

Parent compound isovaleryl chloride and hydrolysis product isovaleric acid:

After evaporation or exposure to air, the substance 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 isovaleryl chloride is determined to hydrolyse rapidly to isovaleric acid and HCl.

Hydrolysis product: 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. Isovaleryl chloride hydrolyses rapidly and forms isovaleric acid and HCl. Isovaleric acid is readily biodegradable, while HCl is inorganic.

Biodegradation

As the parent compound hydrolyses in water within 10 minutes the assessment of the biodegradability relates to the isovaleric acid. The hydrolysis product turned out to be readily biodegradable.

Bioaccumulation

Parent compound isovaleryl chloride and hydrolysis product isovaleric 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 isovaleryl chloride and hydrolysis product isovaleric 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 isovaleryl chloride: From the water surface, the substance will rapidly evaporate into the atmosphere.

Hydrolysis product isovaleric acid: 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 isovaleryl chloride: Over time, the substance will preferentially distribute into the compartments water (10.7%) and air (89.3%).

However, model calculation may be of low relevance as the compound rapidly decomposes in water (t1/2< 10 min).

Hydrolysis product isovaleric acid: Over time, the substance will preferentially distribute into the water (94.9 %).