Registration Dossier
Registration Dossier
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EC number: 247-728-7 | CAS number: 26479-35-6
Endpoint summary
Administrative data
Description of key information
Additional information
Organic carbon adsorption/desorption data are not available for potassium allophonate to assess transport and distribution in the environment. However, based on its physicochemical and environmental fate and transport properties, potassium allophonate is expected to have a low potential for adsorption to organic carbon. In a study performed according to Organisation for Economic Co-operation and Development (OECD) Testing Guideline 108 and under Good Laboratory Practices (GLP), potassium allophonate was found to have an octanol-water partition coefficient (log Pow) of < -1.08 (ABC Laboratories, 2012a), indicating that preferentially partitions in the aqueous phase. Supporting this, a water solubility of value of 429.89 g/L at 23 °C was reported in a test performed according to OECD Testing Guideline 105 and under GLP (Intertek ASG, 2010c). These data indicate that potassium allophonate has the potential to be transported in the environment through surface runoff. However, potassium allophonate has been found to be readily biodegradable in a closed bottle study performed according to OECD Testing Guideline 301D and under GLP (ABC Laboratories, 2013) and a study by Cheng et al. (2005) found rapid hydrolysis (half life of 4 hours at pH 7.3) of allophonate to urea at environmentally-relevant pH. Therefore, while potassium allophonate preferentially partitions in aqueous solutions, it is rapidly broken down in water and, therefore, has limited potential for transport and distribution in the environment. This is further supported by the fact that potassium allophonate has a negligible vapour pressure and is utilized by soil microorganisms as a nutrient source of nitrogen.
References:
ABC Laboratories, Inc. 2012a. Potassium Allophonate: Determination of n-Octanol/Water Partition Coefficient by High Performance Liquid Chromatography (HPLC). Testing laboratory: ABC Laboratories, Inc., 7200 E. ABC Lane, Columbia, MO 65202. Owner company: Kerr Fire Fighting Chemicals, Ashcroft Rd., Knowsley Industrial Park, Kirby, Liverpool L33 7TS, England. Company study no.: 68014. Report date: 2011-05-14.
ABC Laboratories, Inc. 2013. Potassium Allophonate: Determination of the Ready Biodegradability Using the Closed Bottle Test Method. Testing laboratory: ABC Laboratories, Inc., 7200 E. ABC Lane, Columbia, MO 65202. Owner company: Kerr Fire Fighting Chemicals, Ashcroft Rd., Knowsley Industrial Park, Kirby, Liverpool L33 7TS, England. Company study no.: 68015. Report date: 2013-01-09.
Cheng, G., Shapir, N., Sadowsky, M. J. and Wackett, L. P. 2005. Allophonate hydrolase, not urease, functions in bacterial cyanuric acid metabolism. Applied and Environmental Microbiology, 71(8): 4437-45.
Intertek ASG. 2010c. Potassium Allophonate Water Solubility. Testing laboratory: Intertek ASG. Report no.: 1320994. Owner company: Kerr Firefighting Chemicals. Report date: 2010-10-05.
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