Aqueous singlet oxygen reaction kinetics of furfuryl alcohol: effect of temperature, pH, and salt content.

Elena Appiani, Rachele Ossola, Douglas E Latch, Paul R Erickson, Kristopher McNeill

Environmental science. Processes & impacts 2017 Apr 19

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The rate constant for the reaction between furfuryl alcohol (FFA) and singlet oxygen (1O2) in aqueous solution was measured as a function of temperature, pH and salt content employing both steady-state photolysis (β value determination) and time-resolved singlet oxygen phosphorescence methods. The latter provided more precise and reproducible data. The reaction rate constant, krxn,FFA, had a relatively small temperature dependence, no pH dependence and showed a small increase in the presence of high salt concentrations (+19% with 1 M NaCl). A critical review of the available literature suggested that the widely used value of 1.2 × 108 M-1 s-1 is likely overestimated. Therefore, we recommend the use of 1.00 × 108 M-1 s-1 for reactions performed in low ionic strength aqueous solutions (freshwater) at 22 °C. Furthermore, corrections are provided that should be applied when working at higher or lower temperatures, and/or at high salt concentrations (seawater).

Citation

Elena Appiani, Rachele Ossola, Douglas E Latch, Paul R Erickson, Kristopher McNeill. Aqueous singlet oxygen reaction kinetics of furfuryl alcohol: effect of temperature, pH, and salt content. Environmental science. Processes & impacts. 2017 Apr 19;19(4):507-516