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Atmospheric lifetimes and traveling diatances of 15 PAHs (Ac: acenaphthylene, Ace: acenaphthene, Ph: phenanthrene, MePh3: 3 methyl-phenanthrene, MePh9: 9 methyl phenanthrene, MePh1: 1-methyl-phenanthrene, MePh2: 2-methyl-phenanthrene, Ret: retene, B[a] A: benzo [a] anthracene, Chry: chrysene, B[b, j, k] F: benzo [b, j, k] fluoranthene, B [e] P: Benzo [e] pyrene, B [a] P: Benzo [a] pyrene, Ind: indeno [1, 2, 3-cd] pyrene, B [g, h, i] P: Benzo [g, h, i] perylene) at Whitbourne, UK, were estimated by using the rate constants for reaction with OH, O3, and the first order rate constants of eight species of high molecular weight PAHs (i. e. B [a] A, Chry, B [b] F, B [k] F, B [a] P, Ind, B [g, h, i]P and Ret) as a function of humidity, solar intensity and temperature by using Multiple Regression Analysis. The predicted atmospheric lifetime of Ac, Ace, Ph, McPh3, MePh9, MePh2 and MePh1 ranged between 11.42 h 79.12 h in cold period and 1.31 h 14.33 h in warm period respectively. The binary ratios of atmospheric lifetime of B [k] F/B [g, h, i] P, B [k] F/B [g, h, i] P, B [g, h, i] P/Ind and B [k] F/Ind displayed non-significant differences between cold and warm period, indicating that high molecular weight PAHs are difficult to be decomposed by UV light and thus may be conveyed to the rural regions via long range atmospheric transportation (LRAT). The decreased level of the atmospheric lifetime of low molecular weight PAHs in summer can be attributed to an increased level of OH radical content and solar radiation.

Published online: 2010 / 07 / 28

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Appear in 海南醫學院學報

Authors: KLAUS SCHWARZER, PETER FELDENS, DAROONWAN SAKUNA-SCHWARTZ, SIWATT PONGPIACHAN, YVONNE MILKER and DANAI TIPMANEE

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