Quenching rate constants for the removal of SO2 (3B1) by various aromatics
Titel:
Quenching rate constants for the removal of SO2 (3B1) by various aromatics
Auteur:
Wampler, Fred B.
Verschenen in:
Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering
Paginering:
Jaargang 11 (1976) nr. 6 pagina's 397-407
Jaar:
1976
Inhoud:
A competitive technique employing the SO2 (3B1) photosensitized isomerization of cis-C2F2H2 to trans-C2F2H2 in the presence of various aromatics has been used at 3660Å and 22°C to determine the rate constants of the quenching reaction SO2 (3B1) + Mk4?removal. Using PSO2 = 25.1 Torr and Pcis-C2F2H2 = 0.230 Torr the results from Stern-Volmer plots gave k4 estimates (units of l mole-1 sec-1 × 1011) of 0.883 ± 0.085, 1.43 ± 0.13, 2.04 ± 0.19, 2.17 ± 0.26, 2.29 ± 0.20, and 2.15 ± 0.19 for M = benzene, toluene, ethyl benzene, o-xylene, m-xylene, and p-xylene, respectively. These results indicate that increasing the e- density in the aromatic nucleus due to e- releasing alkyl substituents results in an increase in the magnitude of k4. However, the o, m, and p-xylene results indicate that the value of k4 is not sensitive to the position of the alkyl substituent on the aromatic ring.
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