Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

The majority of the substance 1-chlorobutane will be distributed to the water and air compartment (Mackay III), with 48 and 43% respectively, while the remaining 9% of substance are predicted to occur in soil.

There is low adsorption potential to sediment and soils (koc and kow values). The high Henry’s Law constant indicates volatilisation as primary and rapid removal process. Biodegradation in soil is unknown, but also no important environmental route.

In water, 1-chlorobutane is rapidly lost by volatilisation. The remaining substance will be degraded from water by phototransformation (pseudo first-order kinetics) or by hydrolysis (e.g. in groundwater), with n-butanol and sodium chloride or hydrochloric acid as main metabolites. Inherent biodegradation of 1-chlorobutane was reported. The metabolites are rapidly biodegradable.

In the air compartment, the half-life via indirect photolysis was reported at 10.7 days which indicates rapid removal from air. The substance 1-chlorobutane will degrade via photochemically produced hydroxyl radicals in the atmosphere. Due to its water solubility, the substance can washout by rain, and will, however, quickly revolatilise into the atmosphere.

During the short periods of likely exposure in the aquatic compartment, there is low bioaccumulation potential of the substance (experimental BCF values).