Preliminary Analysis of Isoprene Concentration,Distribution,and Diurnal Variance in Guizhou Province
In 2019,to better understand the concentration and distribution of ambient isoprene in Guizhou Province,18 sampling points were selected in areas with severe ozone pollution.They comprised sources of anthropogenic volatile organic compound(AVOC)emission,such as transportation hubs,industrial,urban,and residential areas;and sources of biogenic volatile organic compound(BVOC)emission,such as natural scenic areas and other areas with aquatic and forest vegetation,especially emphasis on the observation of isoprene in areas containing aquatic vegetation.On site sampling of environmental air isoprene and simultaneous online monitoring of ozone concentrations were conducted in batches during the period from July to September 2020.The results indicated that the daily average concentration of isoprene in the atmosphere of Guizhou Province ranged from 0.13 to 6.13 μg/m3.The daily average concentrations of isoprene in the BVOC sampling area,AVOC sampling area,aquatic vegetation area,and forested vegetation area were 1.74,0.52,2.26,and 1.23 μg/m3,respectively.The daytime average concentrations were 2.80,0.54,4.03,and 1.57 μg/m3,respectively,while the nighttime average concentrations were 0.68,0.50,0.49,and 0.88 μg/m3,respectively.The daily average and daytime concentrations of isoprene in the BVOC sampling area were higher than those in the AVOC sampling area,with little difference in nighttime concentrations.The daily average and daytime concentrations of isoprene in aquatic plant cultivation areas were higher than those in forested vegetation areas.This suggests that in some parts of Guizhou,aquatic plants emit more isoprene during the daytime in the summer compared to terrestrial plants such as those in forests.The emissions of isoprene from aquatic plants(such as lotus,reeds,and water chestnuts)warrant further attention and in-depth research.
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