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目的:了解杭州市区大气中挥发性酮、醛、酯的种类和浓度水平。方法:在杭州市城区东、南、西、北部各选择1个采样点,采集大气样品,用热解吸-气质联用法分析了杭州市区大气中挥发性酮、醛、酯类化合物的成分和浓度。结果:在97件样品中,共检出酮类化合物6种、醛类化合物10种、酯类化合物5种。丙酮、2-丁酮和6-甲基-5-庚烯-2-酮、正戊醛、正辛醛、正壬醛、正癸醛、乙酸乙酯、乙酸丁酯是主要污染物。全市区大气中总酮平均浓度为4.46μg/m3、总醛14.43μg/m3、总酯2.46μg/m3。城区西部和市中心的总醛浓度十分接近,且高于东部和南部。结论:杭州市区大气中丙酮、2-丁酮和6-甲基-5-庚烯-2-酮是酮类的主要成分,正戊醛、正辛醛、正壬醛、正癸醛是醛类的主要成分,乙酸乙酯和乙酸丁酯是主要的酯类组分。全市区不同区域总酮、总酯的平均浓度基本相同。
Objective: To understand the types and concentrations of volatile ketones, aldehydes and esters in the urban area of Hangzhou. Methods: One sampling point was selected in the east, south, west and north of Hangzhou city. Atmospheric samples were collected. The composition of volatile ketones, aldehydes and esters in Hangzhou area were analyzed by thermal desorption - gas chromatography - mass spectrometry And concentration. Results: Of 97 samples, 6 kinds of ketones, 10 kinds of aldehydes and 5 kinds of esters were detected. Acetone, 2-butanone and 6-methyl-5-hepten-2-one, n-valeraldehyde, n-octanal, n-nonanal, n-decanal, ethyl acetate and butyl acetate are the major pollutants. The total concentration of total ketone in the city’s atmosphere was 4.46μg / m3, total aldehyde 14.43μg / m3, total ester 2.46μg / m3. The total aldehyde concentration in the western and downtown urban areas is very close, and higher than the eastern and southern. CONCLUSION: Acetone, 2-butanone and 6-methyl-5-hepten-2-one are the main components of ketones in the atmosphere of Hangzhou city. N-pentanal, n-octanal, n-nonanal and n-decanal are The main components of aldehydes, ethyl acetate and butyl acetate are the main ester components. The average concentrations of total ketones and total esters in different regions of the whole city are basically the same.