上海地区2017年夏季大气中羰基化合物的空间分布特征

使用实验室自主研发的多通道含氧挥发性有机物(oxygenated volatile organic compound,OvOC)远程控制采样器,于2017年8月4-7日对上海地区20个监测站点在早高峰(6:00-9:00)时段同步采集大气中20种羰基化合物,并利用2,4-二硝基苯肼(dinitrophenylhydra...

Spatial distribution of atmospheric carbonyl compounds in the Summer of 2017, Shanghai Area

A multi-channel oxygenated volatile organic compound (OVOC) remote control sampler developed in a laboratory and a ternary-mobile phase programme named DNPH- HPLC were used simultaneously to measure the concentration levels of 20 carbonyl compounds in the atmosphere in Shanghai from 4th to 7th August, 2017. The sampling time was 6:00---9:00 a.m. The results indicated that the total concentrations of carbonyls in the atmosphere of the Shanghai area varied from 14.34 to 106.15 $\mu $g/m3, characterised by higher levels in the west and lower levels in the southeast. The concentrations in each area were significantly different. The concentrations in Lingang and Chongming were relatively low, while those of Fengjing and Suzhou Industrial Park were the highest. This pattern was similar to the spatial distribution of VOCs detected in the same periodin the same region. Formaldehyde, acetaldehyde, and acetone were the main carbonyl compounds in the atmosphere, accounting for 68% of the total carbonyl compounds. Suitable correlations were observed among formaldehyde, acetaldehyde, and propionaldehyde. Benzaldehyde, heptanal, octanal, nonanal, and decanal were also correlated, indicating similar sources. The ozone formation potential (OFP) of carbonyl compounds varied from 68.01 to 326.83 $\mu $g/m3, with formaldehyde having the largest contribution and acetaldehyde the second largest. They accounted for 92.93% of the total OFP.