Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Abiotic degradation:

The atmospheric lifetime of the substance is determined by reaction with OH radicals and is approximately 26 days.

Based on a complete lack of hydrolysable groups, the substance may be expected to be hydrolytically stable. An estimated half-life at 20°C of >1 year may be used for assessment.

Biotic degradation:

The biodegradability of the substance was determined in a screening study in accordance with OECD TG 301D. After the 28 day exposure period, the cumulative percentages biodegradation did not exceed 1%. No further data on the degradation in water, sediments or soil is available. Based on the available data, the substance is characterised as not readily biodegradable.

Bioaccumulation:

No bioaccumulation is expected in fish based on the log Kow of 2.2. The BCF in aquatic organisms was estimated using the Veith relationship: log BCF = 0.85·log Kow - 0.70 (applicable for substances with log Kow ≤6). This results in an estimated BCF for fish of 14.8 L/kg w.w.

Transport and distribution:

The substance can be expected to have a low potential for adsorption based on the log Kow of 2.2. The organic carbon-water partitioning coefficient (Koc) was calculated from the log Kow using the non-hydrophobics QSAR in EUSES: log Koc = 0.52·logKow + 1.02). The calculated Koc value is 146 L/kg (log Koc = 2.16). This predicted value is used in the assessment.

The Henry's law constant is calculated in EUSES using the substance's molecular weight of 130.5 g/mol, the experimentally determined vapour pressure of 1065 hPa (at 19.93°C) and the water solubility of 1900 mg/L (at 20°C). The Henry's law constant at environmental temperature (12 °C) is calculated to be 4.64E+03 Pa·m³/mol. Based on this value, the substance is expected to volatilise rapidly from water.