The gas phase tropospheric removal of fluoroaldehydes (CxF2x +1CHO, x=3, 4, 6)
文献类型：期刊论文
| 作者 | Solignac, G.; Mellouki, A.; Le Bras, G.; Yujing, Mu; Sidebottom, H. |
| 刊名 | PHYSICAL CHEMISTRY CHEMICAL PHYSICS
 |
| 出版日期 | 2007-08-21 |
| 卷号 | 9期号:31页码:4200-4210 |
| 英文摘要 | The rate coefficient of the OH reaction with the perfluoroaldehydes C3F7CHO and C4F9CHO have been determined in the temperature range 252-373 K using the pulsed laser photolysis-laser induced fluorescence (PLP-LIF) method: k(C3F7CHO+OH) = (2.0 +/- 0.6) x 10(-12) exp[-(369 +/- 90)/T] and k(C4F9CHO+OH) (2.0 +/- 0.5) x 10(-12) exp[-(356 +/- 70)/T] cm(3) molecule-(1) s(-1), corresponding to (5.8 +/- 0.6) x 10(-13) and (6.1 +/- 0.5) x 10(-13) cm(3) molecule(-1) s(-1), respectively, at 298 K. The UV absorption cross sections of these two aldehydes and CF3(CF2)(5)CH2CHO have been measured over the range 230-390 nm at 298 K and also at 328 K for CF3(CF2)(5)CH2CHO. The obtained results for C3F7CHO and C4F9CHO are in good agreement with two recent determinations but the maximum value of the absorption cross section for CF3(CF2)(5)CH2CHO is over a factor of two lower than the single one recently published. The photolysis rates of C3F7CHO, C4F9CHO and CF3(CF2)(5)CHO have been measured under sunlight conditions in the EUPHORE simulation chamber in Valencia (Spain) at the beginning of June. The photolysis rates were, respectively, J(obs) = (1.3 +/- 0.6) x 10(-5), (1.9 +/- 0.8) X 10(-5) and (0.6 +/- 0.3) x 10(-5) s(-1). From the J(obs) measurements and calculated photolysis rate J(calc), assuming a quantum yield of unity across the atmospheric range of absorption of the aldehydes, quantum yields J(obs)/J(calc) = (0.023 +/- 0.012), (0.029 +/- 0.015) and (0.046 +/- 0.028) were derived for the photodissociation of C3F7CHO, C4F9CHO and CF3(CF2)(5)CHO, respectively. The atmospheric implication of the data obtained in this work is discussed. The main conclusion is that the major atmospheric removal pathway for fluoroaldehydes will be photolysis, which under low NOx conditions, may be a source of fluorinated carboxylic acids in the troposphere. |
| WOS记录号 | WOS:000249100500021 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/22412]  |
| 专题 | 生态环境研究中心_大气环境科学实验室 |
| 推荐引用方式 GB/T 7714 | Solignac, G.,Mellouki, A.,Le Bras, G.,et al. The gas phase tropospheric removal of fluoroaldehydes (CxF2x +1CHO, x=3, 4, 6)[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2007,9(31):4200-4210. |
| APA | Solignac, G.,Mellouki, A.,Le Bras, G.,Yujing, Mu,&Sidebottom, H..(2007).The gas phase tropospheric removal of fluoroaldehydes (CxF2x +1CHO, x=3, 4, 6).PHYSICAL CHEMISTRY CHEMICAL PHYSICS,9(31),4200-4210. |
| MLA | Solignac, G.,et al."The gas phase tropospheric removal of fluoroaldehydes (CxF2x +1CHO, x=3, 4, 6)".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 9.31(2007):4200-4210. |
入库方式： OAI收割
来源：生态环境研究中心
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