| Popis: |
Chemical laboratories of Universities are an important source of air pollutant emissions in urban area, but their detailed emission factors have rarely been investigated. This study determined the concentration level and chemical composition spectrum of air pollutants from 21 typical chemical laboratories of universities in Beijing. Based on quantitative analysis using a GC-MS/FTIR/FID system, the emission intensity of each laboratory area was estimated, the ozone formation potential (OFP) was calculated, and the emission inventory of atmospheric pollutants in chemical laboratories of universities in Beijing was estimated. According to the results, the atmospheric pollutants discharged by the laboratories could be characterized by wide species distribution and low concentrations of single components. The average concentrations of atmospheric pollutants from the three outlets were 20.6 ± 8.9 µmol/mol (mean ± S.D.), 26.5 ± 4.8 µmol/mol, and 14.7 ± 5.8 µmol/mol. VOC emission was significantly affected using organic solvents. Pollutant emissions from the laboratories exhibited strong periodicity, and the raw materials used in the experiments were the main factor affecting the final pollutant concentration. The emission intensities of atmospheric pollutants from the three outlets were 35.06 ± 38.08 g/(m2·d), 22.83 ± 18.88 g/(m2·d) and 24.03 ± 28.78 g/(m2·d), and their TOFP were 27.8 ± 39.1 µmol/mol, 22.0 ± 21.2 µmol/mol, and 14.5 ± 28.9 µmol/mol. The total emission of atmospheric pollutants from university chemical laboratories in Beijing in 2019 was estimated at approximately 2630.8 ± 2710.3 t, including 675.8 ± 610.6 t of inorganic gaseous pollutants and 1932.0 ± 2081.2 t of VOCs, with Haidian District as the largest contributor. |
