Study on Pollution Characteristics of Aldehydes and Ketones in Guangxi
In order to investigate the pollution of aldehydes and ketones in Guangxi,the aldehydes and ketones in ambient air in typical cities,including Nanning,Guilin,Beihai,Guigang,Baise,Hezhou and Laibin,were monitored from September to October 2022 and from May to June 2023.The concentration level,component characteristics and the ozone formation potential(OFP)of the main aldehydes and ketones in different cities were analyzed,and the source of aldehydes and ketones were analyzed by the ratio method.The study showed that the typical cities in Guangxi,such as Nanning,Guilin and Laibin,exhibited a similar seasonal pattern of aldehydes and ketones mass concentrations to ozone with higher concentrations in autumn(September-October 2022)compared to spring and summer(May-June 2023).During the monitoring period,the average concentration of aldehydes and ketones in Guangxi was 23.64 µg/m3,with the highest concentration in Hezhou(31.30 µg/m3)and the lowest concentration in Beihai(13.58 µg/m3).Compared with other cities,the concentration level of aldehydes and ketones in ambient air in cities of Guangxi was below average.Formaldehyde accounted for the highest proportion,ranged from 43.8％to 58.2％.The OFP in each city ranged from 77.32 μg/m3(Beihai)to 159.35 μg/m3(Guigang),among them,formaldehyde contributed the most to OFP,accounting for 52.1％～70.1％.The ratio of formaldehyde to acetaldehyde(C1/C2)in seven cities ranged from 2.55 to 3.22,indicating aldehydes and ketones originate from vehicle exhaust emissions and anthropogenic sources of hydrocarbon oxidation.Notably,Beihai and Baise had C1/C2 ratio around 2.6,indicating a more significant impact from vehicle exhaust and other anthropogenic source,it is necessary to strengthen the control of relevant emission source during ozone pollution.
Ambient airAldehyde and ketonesPollution characteristicsOzonePrecursors
NETL
NSTL
万方数据
