杭州市环境空气中二噁英类物质检测与分析

为了解二噁英类物质(PCDD/Fs)在环境空气中污染现状及不同季节不同时段浓度、组成和存在形式等的变化情况,于夏、冬两季对杭州西湖区空气中PCDD/Fs进行了采样分析。结果表明,空气中PCDD/Fs毒性当量浓度与国内其他城市(北京、上海、广州)相近,夏、冬两季空气中PCDD/Fs质量浓度和毒性当量浓度分别为4.92 pg/m3、0.34 I-TEQ pg/m3和4.51 pg/m3、0.40 I-TEQ pg/m3,夏季PCDD/Fs毒性当量浓度略低于冬季;在分时段采样检测结果中,晚间空气中PCDD/Fs质量浓度和毒性当量浓度均高于白天空气中的PCDD/Fs浓度;夏季样品中TCDD/Fs、PeCDD/Fs主要以气相的形式存在,HpCDD/Fs、OCDD/F主要以颗粒相的形式存在,冬季样品中PCDD/Fs主要以颗粒相形式存在。

Detection and Analysis of Dioxins in Ambient Air of Hangzhou

The dioxins in ambient air had been detected for their daily and seasonal changes of concentration and structure during summer and winter in Hangzhou urban area.The results indicated that PCDD/Fs I-TEQ concentration in the air was equal to that of other cities（Beijing,Shanghai and Guangzhou）.Concentration of PCDD/Fs in summer and winter was 4.92 pg/m3（0.34 I-TEQ pg/m3）and 4.51 pg/m3（0.40 I-TEQ pg/m3）respectively.The I-TEQ concentration of summer was lower than that of winter.The PCDD/Fs concentration（I-TEQ concentration） in night was higher than that of day in the area.In summer,the most TCDD/Fs and PeCDD/Fs tend to partition gas phase,and,HpCDD/Fs and OCDD/F tend to partition particle phase.The most PCDD/Fs tend to partition particle phase in winner.