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Inhibition of Humic Substances Mediated Photooxygenation of Furfuryl Alcohol by 2,4,6-trimethylphenol. Evidence for Reactivity of the Phenol With Humic Triplet Excited States

Sabrina Halladja, Alexandra Ter Halle, Jean-Pierre Aguer, Abdelaziz Boulkamh, Claire Richard

Environ Sci Technol. 2007 Sep 1;41(17):6066-73.

PMID: 17937283

Abstract:

To probe the reactivity of 2,4,6-trimethylphenol with humic triplet excited states, we investigated its influence on the humic substances-mediated photooxygenation offurfuryl alcohol. Elliott soil humic and fulvic acids were employed for these experiments. When added in the concentration range of 10(-4) - 10(-3) M, 2,4,6-trimethylphenol inhibited furfuryl alcohol photooxygenation to an extent depending on its concentration. The inhibiting effect decreased as the oxygen concentration was increased. By postulating that 2,4,6-trimethylphenol competes with oxygen for reaction with humic triplet excited states and with furfuryl alcohol for reaction with singlet oxygen, we obtained kinetic laws describing the consumption profiles of furfuryl alcohol and 2,4,6-trimethylphenol. Experimental rates of 2,4,6-trimethylphenol and furfuryl alcohol loss could be satisfactorily fitted with 1.09-1.16 for the ratio k2/k3, where k2 and k3 are the reaction rate constants of humic triplet excited states with oxygen and 2,4,6-trimethylphenol, respectively. These types of experiments could be extended to a variety of substrates to measure their reaction rate constants with humic triplet excited states.

Chemicals Related in the Paper:

Catalog Number Product Name Structure CAS Number Price
AP527606 2,4,6-Trimethylphenol 2,4,6-Trimethylphenol 527-60-6 Price
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