Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Stability , biodegradation, bioaccumulation (water compartment/terrestrial compartment):

The substance is very soluble in water (solubility value of 2450 mg/l at 20 °C). In water or in moist soil surfaces the substance can undergo a substitution reaction to form 1-propanol as the hydrolytic product. 1-bromopropane has a measured hydrolysis half-life at 25 °C and at pH 7 of 23 days. 1 -bromopropane is expected to volatilize from water and moist soil surfaces, based on an estimated Henry's Law constant of 742.96 Pa*m3/mol (0.00732 atm*m3/mol). From dry soil surfaces, an estimated Koc of 66.4 L/kg (KOCWIN v2.00) indicates that 1-bromopropane has a very low affinity to soil and due to its high vapor pressure it should quickly volatilize to atmosphere. Although the substance is found to be not readily biodegradable, the abiotic (volatilization and hydrolysis) processes are important and can indicate that the substance will not remain in water phase. This can be further supported by models estimated results (Volatilization From Water program; EPISuite v4.00) showing volatilization half-life from a model river was calculated as 1.2 hours, from a model lake, 4.4 days. Based on the above argumentations it can be concluded that the substance can be considered as of no concern to aquatic /terrestrial organisms. This can be further supported by an estimated low bioconcentration factor of 11.29 L/kg wet-wt (BCFBAF v3.00).

Stability (atmospheric compartment):

If released to the atmosphere, 1-bromopropane will exist solely in the vapour-phase based on an experimental vapour pressure of 14.8 kPa (20 °C). In the vapour-phase, it is predicted to react fairly rapidly with hydroxyl radicals with an estimated half-life of 11.6 days (AOPWIN v1.92).

Based on the study on n-propyl bromide Ozone Depletion Potential in the MOZART 3.1 three-dimensional chemical-transport model of the global atmosphere from 2008, the nPB ODP (Ozone Depletion Potential) is 0.0194 .