Matsunaga Sou, Mochida Michihiro, Kawamura Kimitaka
Institute of Low Temperature Science, Hokkaido University, N19 W8, Kita-Ku, Sapporo 060-0819, Japan.
Chemosphere. 2004 May;55(8):1143-7. doi: 10.1016/j.chemosphere.2003.10.004.
Atmospheric concentrations of 4-oxopentanal (4-OPA) in both gas and particulate phase were measured at the experimental forest, 200 km north of Sapporo, Japan, from August 13 to 15, 2001. 4-OPA was collected using an annular denuder sampling system and measured with a gas chromatography employing benzylhydroxyl oxime derivatization. Its gas phase concentrations ranged from 180 ng m(-3) (44 pptv) to 1570 ng m(-3) (384 pptv), whereas those in the particulate phase were from below the detection limit (25 ng m(-3)) to 207 ng m(-3). The particulate 4-OPA accounted for 28% (particle/(gas+particle)) of the total concentration as the maximum at 06:00 on August 15th (average: 10%). The particulate concentrations of 4-OPA were found to be comparable to those of pinonic acid, indicating that 4-OPA is also an important constituent of organic aerosols in the forestal atmosphere. Here, we report, for the first time, the concentrations of 4-OPA in both gas and particulate phase and its diurnal variations in the forestal atmosphere.
2001年8月13日至15日，在日本北海道以北200公里处的实验森林中，对气相和颗粒相中4-氧代戊醛（4-OPA）的大气浓度进行了测量。使用环形剥蚀器采样系统收集4-OPA，并采用苄基羟肟衍生化的气相色谱法进行测量。其气相浓度范围为180 ng m(-3)（44 pptv）至1570 ng m(-3)（384 pptv），而颗粒相浓度则从低于检测限（25 ng m(-3)）到207 ng m(-3)。颗粒态4-OPA在8月15日06:00时占总浓度的28%（颗粒/（气相+颗粒）），为最大值（平均值：10%）。发现4-OPA的颗粒相浓度与松香酸的颗粒相浓度相当，这表明4-OPA也是森林大气中有机气溶胶的重要成分。在此，我们首次报告了森林大气中气相和颗粒相中4-OPA的浓度及其日变化情况。
