Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

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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.