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Environmental fate & pathways

Endpoint summary

Administrative data

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Phototransformation in air

Parent compound butyryl chloride and hydrolysis product butyric 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 solutions.Therefore this estimate may be of low relevance.

Hydrolysis

Parent compound butyryl chloride is determined to hydrolyse rapidly to butyric acid and HCl.

Hydrolysis product butyric 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. Butyryl chloride hydrolyses rapidly and forms butyric acid and HCl. Butyric 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 butyric acid. The hydrolysis product turned out to be readily biodegradable.

Bioaccumulation

Parent compound butyryl chloride and hydrolysis product butyric 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 butyryl chloride and hydrolysis product butyric 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 chlorid in aqueous solutions.

Henry`s Law constant

Parent compound butyryl chloride From the water surface, the substance will rapidly evaporate into the atmosphere.

Hydrolysis product butyric 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 butyryl chloride: Over time, the substance will preferentially distribute into the compartments water (28.7%) and air (71.2%).

However, the model estimation may be of low relevance due to the rapid hydrolysis of the acid chloride in aqueous solutions.

Hydrolysis product butyric acid: Over time, the substance will preferentially distribute into the compartments water (89.9%) and air (10.0%).

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