caa a22 4500 475823281 CHVBK 20180406123824.0 cr unu---uuuuu 170329e20000601xx s 000 0 eng 10.1023/A:1006340727148 doi (NATIONALLICENCE)springer-10.1023/A:1006340727148 The Reactivity of Biogenic Monoterpenes towards OH· and SO4-· Radicals in De-Oxygenated Acidic Solution [Elektronische Daten] [G. Buxton, G. Salmon, J. Williams] The reactivity of some selected biogenic monoterpenecompounds towards important aqueous phase free-radicaloxidants, namely OH· and SO4 -·, have beeninvestigated using the complementary experimentaltechniques of pulse radiolysis and laser flashphotolysis (λ = 248 nm). Rate constants forthe reactions of the OH· radical with cis-verbenol andmethacrolein have been determined to be (6.8 ± 0.5) ×109 dm3 mol-1 s-1 and (8.0± 0.7) × 109 dm3 mol-1s-1,respectively (T = 20 °C, pH 4.0, Ionic strength∼ 0 mol dm-3). Rate constants and activationenergies for the reactions of the SO4 -·radical have been measured for the following compounds(T = 20 °C, pH 4.0, Ionic strength = 0.03 moldm-3): α-pinene (k = (3.1 ± 0.1) ×109 dm3 mol-1 s-1;E act. =(8.9 ± 1.3) kJ mol-1), α-terpineol(k = (4.1 ± 0.1) × 109 dm3mol-1s-1; E act. = (13.4 ± 0.6) kJmol-1), cis-verbenol (k = (3.2 ± 0.2) ×109 dm3 mol-1 s-1;E act. =(10.0 ± 0.7) kJ mol-1), verbenone (k = (1.6± 0.1) × 109 dm3 mol-1s-1;E act. = (6.1 ± 0.7) kJ mol-1), myrtenal(k = (1.85 ± 0.1) × 109 dm3mol-1s-1; E act. = (7.5 ± 0.7) kJmol-1)and methacrolein (k = (1.18 ± 0.1) × 109dm3 mol-1 s-1). In most instances theabsorption spectra of the intermediate products formedby these reactions have been measured which, inconjunction with strategic conductiometric studies,have been used to suggest plausible mechanisms for theoxidation in acidic de-oxygenated solution. Kluwer Academic Publishers, 2000 atmospheric aqueous phase nationallicence biogenicVOC's nationallicence reactivity nationallicence free-radicals nationallicence Buxton G. The School of Chemistry, University of Leeds, LS2 9JT, Leeds, U.K. aut Salmon G. The School of Chemistry, University of Leeds, LS2 9JT, Leeds, U.K. aut Williams J. The School of Chemistry, University of Leeds, LS2 9JT, Leeds, U.K. aut Journal of Atmospheric Chemistry Kluwer Academic Publishers 36/2(2000-06-01), 111-134 0167-7764 36:2<111 2000 36 10874 https://doi.org/10.1023/A:1006340727148 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1006340727148 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Buxton G. The School of Chemistry, University of Leeds, LS2 9JT, Leeds, U.K aut NATIONALLICENCE 700 1- Salmon G. The School of Chemistry, University of Leeds, LS2 9JT, Leeds, U.K aut NATIONALLICENCE 700 1- Williams J. The School of Chemistry, University of Leeds, LS2 9JT, Leeds, U.K aut NATIONALLICENCE 773 0- Journal of Atmospheric Chemistry Kluwer Academic Publishers 36/2(2000-06-01), 111-134 0167-7764 36:2<111 2000 36 10874 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer