title: Aqueous singlet oxygen reaction kinetics of furfuryl alcohol: effect of temperature, pH, and salt content.
abstract: 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 × 108M-1s-1is likely overestimated. Therefore, we recommend the use of 1.00 × 108M-1s-1for 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).
authors.affiliation: Institute of Biogeochemistry and Pollutant Dynamics (IBP), Department of Environmental Systems Science, ETH Zurich, 8092 Zurich, Switzerland. paul.erickson@env.ethz.ch kris.mcneill@env.ethz.ch.
authors.forename: Elena
authors.initials: E
authors.lastname: Appiani
authors.forename: Rachele
authors.initials: R
authors.lastname: Ossola
authors.forename: Douglas E
authors.initials: DE
authors.lastname: Latch
authors.forename: Paul R
authors.initials: PR
authors.lastname: Erickson
authors.forename: Kristopher
authors.initials: K
authors.lastname: McNeill
mesh_terms: D005663:Furans / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008163:Luminescent Measurements; D010782:Photolysis; D026082:Singlet Oxygen / Q000737:chemistry*; D012965:Sodium Chloride; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D005663:Furans; D014874:Water Pollutants, Chemical; D026082:Singlet Oxygen; D012965:Sodium Chloride; C012986:furfuryl alcohol