Registration Dossier
Registration Dossier
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EC number: 915-640-4 | CAS number: -
Endpoint summary
Administrative data
Description of key information
Additional information
The biodegradability of Dowfax 3B2 has been evaluated in various biodegradation screening studies in water deemed reliable.
In two studies of the ready biodegradability of DOWFAX* 3B2 according to the OECD 301E testing guideline (one conducted in compliance with GLP standards), 10 % or less degradation was observed up to 42 days of incubation, based on the reduction in dissolved organic carbon (DOC). Consequently, DOWFAX 3B2 could not be classified as readily biodegradable.
A non-GLP study of the aerobic biodegradability of DOWFAX 3B2 by the continuous activated sludge test was conducted according to the OECD 303A testing guideline. In this study, ultimate biodegradability was evaluated through DOC removal, while chemical-specific analysis by HPLC was used to follow primary degradation. The results showed only modest degradation (7.4 %) based on DOC removal, while the HPLC data showed complete primary biodegradation of the test material starting on day 15. This result indicates the inherent primary biodegradability of DOWFAX 3B2.
In two additional studies of the biodegradability of DOWFAX 3B2 using the Soap & Detergent Association (SDA) Semi-Continuous Activated Sludge test, the material was degraded by 97 % or more based on reduction in methylene blue active substance, providing additional evidence for the inherent primary biodegradability of this substance.
Additional members of the ADPODS category have been tested for ready and inherent biodegradability using OECD guideline methods, as well as the SDA Semi-Continuous Activated Sludge test. As with DOWFAX 3B2, these substances also demonstrate inherent primary biodegradability.
Studies of the biodegradability of DOWFAX 3B2 in aquatic sediment or soil are not available. However, simulation tests in surface waters, sediments, and soils using the structurally-related DOWFAX 8390 showed that the substance is expected to be slowly but ultimately biodegraded to CO2 and water in these environments. Half-lives for ultimate biodegradation in these matrices could be expected to exceed 180 days. In the limited instances where test material analysis was performed, rapid primary degradation (half-life less than 7 days) was observed.
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