College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China.
Sci Total Environ. 2010 Aug 1;408(17):3523-9. doi: 10.1016/j.scitotenv.2010.05.013.
Seasonal and diurnal variations of carbonyl compounds were investigated at two sampling sites (Liwan and Wushan) in the ambient air of Guangzhou, China. Air samples were collected during 2005 from January to November, and carbonyl compounds were analyzed with HPLC. The results show that carbonyls exhibit distinct seasonal variation. The total concentrations of 21 carbonyls detected ranged from 2.64 to 103.6 microg m(-3) at Liwan and from 5.46 to 89.9 microg m(-3) at Wushan, respectively. The average total concentrations of carbonyls at both Liwan and Wushan decreased in order of summer>spring>autumn>winter. Formaldehyde, acetaldehyde, and acetone were the most abundant carbonyl compounds, which accounted for more than 60% of the total concentrations of carbonyls. The mean concentration ratios of summer/winter were all > 1.0 for the total concentrations and the individual carbonyl compound. The diurnal variation of carbonyls was not distinct in this study. The average concentration ratios of formaldehyde/acetaldehyde (C1/C2) varied from 0.71 to 1.32 and 0.65 to 1.14 at Liwan and Wushan, respectively, and the average concentration ratios of acetaldehyde/propionaldehyde (C2/C3) varied from 5.42 to 7.70 and 5.02 to 13.9 in Liwan and Wushan, respectively. Regarding photochemical reactivity of carbonyls and the ozone production, acetaldehyde, butyraldehyde, formaldehyde, and valeraldehyde account for 75-90% to the total propene-equivalent concentrations, while formaldehyde, acetaldehyde, valeraldehyde, butyraldehyde, and propionaldehyde contribute 89-96% to the total ozone formation potentials (ranging from 105 to 274 microg m(-3)). The ozone formation potentials in summer were higher by 1-2 times than those in the other seasons.
在中国广州的两个采样点（荔湾和巫山）的环境空气中，研究了羰基化合物的季节性和日变化。2005 年 1 月至 11 月采集了空气样本，并使用 HPLC 进行了羰基化合物分析。结果表明，羰基化合物表现出明显的季节性变化。在荔湾检测到的 21 种羰基化合物的总浓度范围为 2.64 至 103.6μg/m³，在巫山的总浓度范围为 5.46 至 89.9μg/m³。荔湾和巫山的羰基化合物总浓度平均值夏季>春季>秋季>冬季依次降低。甲醛、乙醛和丙酮是最丰富的羰基化合物，占羰基化合物总浓度的 60%以上。总浓度和单个羰基化合物的夏季/冬季平均浓度比均大于 1.0。本研究中，羰基化合物的日变化不明显。荔湾和巫山的甲醛/乙醛（C1/C2）比值分别为 0.71-1.32 和 0.65-1.14，乙醛/丙醛（C2/C3）比值分别为 5.42-7.70 和 5.02-13.9。关于羰基化合物的光化学反应活性和臭氧生成，乙醛、丁醛、甲醛和戊醛占丙烯当量总浓度的 75-90%，而甲醛、乙醛、戊醛、丁醛和丙醛占臭氧生成潜能的 89-96%（范围为 105-274μg/m³）。夏季的臭氧生成潜能比其他季节高 1-2 倍。
