呼和浩特市大气中多环芳烃的分布规律

本文采用聚氨基甲酸乙酯泡沫(PUF)吸附块和玻璃纤维滤膜(GF)同时采集大气中气态和颗粒物中的多环芳烃(PAHs)。对居民区和草原清洁区分别进行冬夏两季间歇式采样,用高效液相色谱测定了蒽、芘、(芦出)、苝、苯并(a)芘、二苯并(a、h)蒽、苯并(ghi)苝等多环芳烃的含量。结果表明,在居民区四环以下的PAHs有一半以上存在于气态中,四环以上的PAHs大部分存在于颗粒物上;夏季每种PAHs在气态中的百分率比冬季高;草原清洁区与居民区PAHs在气态和颗粒物上的百分率不同;冬季居民区污染严重时间是10:00—11:30和17:30—21:30,而夏季污染严重时间是6:00—10:00和18:00—22:00。

Distribution Pattern of Polycyclic Aromatic Hydrocarbons in the Atmosphere in Huhhot City

The PAHs in the vapor phase and on the particulates have been collected simultaneously through PUF and fiberglass filter film. The batch collecting samples have been carried out respectively in both inhabited areas and clean meadow areas in the two seasons of winter and summer. The contents of PAHs, such as anthracene, pyrene, chrysene, perylene, bezo(a) pyrene, dibenz(a, h) anthracene and benzo ghi ]-penylene, have been determined by using HPLC. The results show that over half of the PAHs of below four rings were found in the vapor phase and most of the PAHs of over four rings were found in particulates; the percentage of each of PAHs in the vapor phase in summer was higher than that in winter; the percentages of the PAHs in the vapor phase and on particulates in clean meadow areas were different from those in inhabited areas; and in winter the time at which the pollution in inhabited areas was most serious was 10 ' 00-11 : 30 and 17 : 30-21 : 30 but in summer the time was 6 : 00-10 : 00 and 18: 00-22: 00.