Registration Dossier
Registration Dossier
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EC number: 284-660-7 | CAS number: 84961-70-6
Endpoint summary
Administrative data
Description of key information
Additional information
The primary means of HAB degradation in the environment is biodegradation. Experimental results for HAB do not meet the criteria for ready biodegradation, in large part due to the extremely low solubility in water. Results of the BODIS test for insoluble substances shows HAB biodegradation of 28% within 28 days.
Additional biodegradation data are available on C10-C14dialkylbenzene, a major component (over 70%) of LAB alkylate bottoms. Data from these studies indicate 28-41% mineralization in 28 days and 43-54% mineralization in 48 days. These tests were conducted at concentrations higher than the water solubility of the materials and biodegradation may be more rapid at lower concentrations. Additional data on LAB, which is the most water soluble component of the HABs, indicate that it is readily biodegradable based on a GLP study showing 64% biodegradation after 28 days.
Based on these data and the structural similarities to LAB, the HABs would be expected to undergo faster biodegradation at water soluble concentrations.
Anaerobic and aerobic biodegradation simulation studies in soil were also perfomed using radiolabelled C10 dialkylbenzene, a major category of HAB which comprises 20 -70% of the composition. The testing was perfomed in four different soils with an exposure period of 120 days (in the anaerobic testing, there was a 28 day aerobic exposure period prior to the 120 day anaerobic exposure period). The initial concentration was 5.17 uCi/vessel for the anaerobic test, and 4.55 uCi/vessel for the aerobic test. Half-lives for the substance in the aerobic testing ranged from 23 to 178 days at 20 C. When the results were adjusted for 12 C using the Arrhenius equation, the half-lives ranged from 49 to 378 days. The half-lives determined for the various soils would classify HAB as not persistent (soil #3), persistent (soil #2), and very persistent (soils #1 and #4). Anaerobic degradation was significantly slower with half-lives ranging from 1114 to 4.6E+08 days and 2365 to 8.6E+08 days at 20 and 12 C, respectively.
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