Registration Dossier
Registration Dossier
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EC number: 444-960-2 | CAS number: 39148-16-8
Endpoint summary
Administrative data
Description of key information
Additional information
Fosetyl-Sodium is not readily biodegradable as observed in an OECD 301 D test, which resulted in – 1% biodegradation after 28 days. However, the substance is inherently biodegradable as seen in an OECD 302C test (86.9% biodegradation after 28 days based on BOD and > 99.9% biodegradation after 28 days based on residue analysis). Therefore, the target substance is not considered persistent in the aquatic environment. Due to the high water solubility of the substance (770 g/L at 20 °C and pH 5) and the low log Kow (log Kow = - 2.5 at 20 °C and a pH of 2.5 – 2.6) water is however expected to be the main exposure route for this substance. Abiotic degradation of the substance via hydrolysis is not a relevant pathway for the dissipation of the substance in the aquatic environment. Based on the results with a structural analogue substance, Fosetyl-Aluminium, no hydrolysis was observed after 5 days at 50 °C in pH 4, 7, and 9 solutions in the pre-test. Thus, hydrolysis is also expected to be negligible for the target substance Fosetyl-Sodium. The vapour pressure of Fosetyl-Sodium is below the limit of detection (< 1 x 10 ^-5 hPa at 20 °C), thus the compound is not volatile and air is negligible as route of exposure for this substance. Therefore, no long-range transport via the atmosphere resulting in potential accumulation and subsequent deposition of the substance is expected for this compound. Because the log Koc for Fosetyl-Sodium ranges from 2.79 – 3.96 (Koc = 613.9 – 9216 L/kg), the substance shows potential for adsorption to the soil/sediment compartment. Due to the low log Kow (-2.5) Fosetyl-Sodium exhibits a low potential for bioaccumulation.
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