Registration Dossier
Registration Dossier
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EC number: 405-430-6 | CAS number: 65143-89-7
Endpoint summary
Administrative data
Description of key information
Additional information
Dowfax 8390 is not readily biodegradable but inherently biodegradable not fulfilling specific criteria. Dowfax 8390 is biodegradable in river water and sediment as well as soils.
The biodegradability of Dowfax 8390 has been evaluated in various biodegradability screening studies. In Soap and Detergent Association-Semi-Continuous Biodegradability Tests, greater than 90% reduction were achieved in methylene blue active substances (i.e., > 90% primary biodegradation). In a Closed Bottle study (OECD 301D) study, 0 -6% biodegradation was observed. Dowfax 8390 is not readily biodegradable but inherently biodegradable not fulfilling specific criteria.
In a river sediment simulation study, under aerobic conditions, 89% of the [14C]MADS (a major component of Dowfax 8390) was degraded to [14C]products within 7 days. Mineralization of [14C]MADS to 14CO2 reached 5% after 83 days, and 15% after 181 days. Mineralization of [14C]MADS to 14CO2 reached approximately 2% after 181 days in reaction mixtures initially incubated under aerobic conditions for 7 days, followed by anaerobic incubation. Little degradation of [14C]MADS was detected in reaction mixtures incubated under exclusively anaerobic conditions. The half life of Dowfax 8390 in water and sediment is 2.2 d.
In a separate soil and sediment study, within one year, mineralization of [14C]MADS to 14CO2 was observed in all of the soil and sediment mixtures, with an average of 51 ± 19% of the radioactivity added (± 1 standard deviation). Mineralization of [14C]MADS in biologically-inhibited controls, prepared with 2% formalin, was </= 0.3%, confirming that the mineralization observed in the viable mixtures was biologically mediated. Since these soils and sediments came from diverse environments, these results indicate that microorganisms capable of completely degrading DOWFAX 8390 Surfactant appear to be ubiquitous. Mineralization of [14C]MADS reached 3 to 8% after 3 weeks. This level of mineralization was consistent with results from previous biodegradation studies using fresh, un-acclimated activated sludge. The half life of Dowfax 8390 in soil and sediment is 53 -180 d.Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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