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Environmental fate & pathways

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The biodegradation and fate of 2,4 -di-tert.-butylphenol in different environmental compartments has been assessed in several OECD guideline studies, including screening and simulation tests.

Two screening studies have been conducted which assess biodegradability in water (activated sludge respiration inhibition test), an Inherent biodegradability test (Modified MITI Test II) according to OECD guideline 302C and a BOD-Test for Insoluble Substances. From the results of these tests it can be concluded that 2,4-di-tert-butylphenol does not readily biodegrade and is not inherently biodegradable.

Further evidence on the environmental fate of 2,4-DTBP is available from simulation studies in soil (aerobic/anaerobic), water-sediment systems (aerobic/anaerobic) and surface water (aerobic). The results obtained in those studies show that 2,4 -DTBP primarily volatilizes and undergoes only minor transformation processes.

In the surface water mineralization study, four major transformation products (>5% AR) were observed and identified by GC-MS as 2-tert-butyl-4-nitrophenol, 4-tert-butyl-2,6-dinitrophenol, 2-tert-butyl-4,6-dinitrophenol, and 2,4-di-tert-butylphenol. Based on the results of this study 2,4-di-tert-butylphenol would not be expected to hydrolyze in surface water or further mineralize to CO2 within 60 days, but would expect to dissipate from a surface water in the environment or degrade to multiple components.