广州市三条重污染河涌春季VOCs排放通量的研究

Research on Emission Fluxes of Volatile Organic Compounds in Spring From Three Heavily Polluted Rivers in Guangzhou

采用Tenax采样管和热解吸与GC-MS联用仪研究广州3条重污染河涌春季释放的挥发性有机物(VOCs)的组成和排放通量.结果表明,3条重污染河涌共检出烷烃、卤代烃、芳香烃、烯烃、醛、醇和其他等7类共37种VOCs成分.BTEX(苯、甲苯、乙苯、间对二甲苯和邻二甲苯)在各采样点中所占比例最大,均占40％以上.24h连续监测显示,VOCs的排放通量在22:00达到峰值,即66.2μg/(m2·h).3条重污染河涌的TVOCs排放通量变化范围34.2～94.0μg(m2·h),其中BTEX排放通量变化范围为15.2～ 53.2 μg/(m2·h).

Tenax sampling tubes,thermal desorption and GC-MS technology are used to investigate the composition and the fluxes of Volatile Organic Compounds(VOCs) in spring emitted from three heavily polluted rivers in spring in Guangzhou,South China.The results show that 37 VOCs are identified from the three rivers and composed of alkanes,halides,aromatics,alkenes,aldehydes,alcohols and others.BTEX(benzene,toluene,ethylbenzene,m/p xylene,o-xylene) accounts for over 40% of total VOCs.The 24 h continuous monitoring suggests the emissions of VOCs peak at 22:00 reaching 66.2 μg/(m2·h).The emission fluxes of TVOCs range from 34.2~94.0 μg/(m2·h),while the emission fluxes of BTEX range from 15.2~53.2 μg/(m2·h).