Abstract
This study examined the decomposition of perfluorooctanoic acid (PFOA) in enzyme-catalyzed oxidative humification reactions (ECOHRs). ECOHRs make up a class of reactions that are ubiquitous in the environment. Approximately 50% of PFOA in a mineral buffer solution decomposed upon addition of laccase and 1-hydroxybenzotriazole after 157 days with a pseudo-first-order rate constant of 0.0044 day–1 (r2 = 0.89). No shorter carbon-chain perfluorocarboxylic acids were detected as degradation products during the experiment. However, partially fluorinated shorter-chain alcohols and aldehydes were identified by high-resolution mass spectrometry. These partially fluorinated compounds were likely products resulting from PFOA degradation via a combination of free radical decarboxylation, rearrangement, and coupling processes. Fluoride was detected in the reaction solution, and the concentration indicated a 28.2% defluorination ratio during the treatment. This finding suggests that PFOA may be transformed during humif...
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