室内空气中苯和甲苯浓度分布特征调查

Survey on Benzene and Toluene Concentration DistributionCharacteristics in Indoor Air

室内挥发性有机物(VOCs)中的苯和甲苯是造成室内空气污染的主要原因之一。对某系列办公室和民用住宅进行空气采样运用气相色谱法进行分析。结果表明,对于内部装修后超过1年的办公室,室内苯、甲苯浓度均不超过标准限值;苯浓度占TVOC的1.3％～13％,其中大部分房间为7％左右;甲苯浓度占TVOC的0％～8.5％,其中大部分房间为5％以下;室内苯浓度一般高于甲苯浓度。对于内部装修后1～2月内的民用住宅,室内苯、甲苯污染相当严重,部分住宅远远超出标准限值;苯浓度一般低于或接近甲苯浓度。因此,可以认为室内甲苯的释放速度比苯快。

Volatile organic compounds (VOCs), especially, Benzene and Toluene, are some main pollutants in indoor air pollution. Air sampling has been done for several offices which have been decorated for more than one year, and civil houses which have been decorated just for one or two months, and then Benzene concentration and Toluene concentration were measured by Gas Chromatography. As for those offices, both Benzene concentration and Toluene con centration did not exceed indoor air quality standards; Benzene concentration was between 1.3%-13% of TVOCs, generally about 7% in most of offices; Toluene concentration was between 0% - 8.5% of TVOCs, gen erally less than 5% in most of offices; generally speaking, Benzene concentration was higher than Toluene concentration in indoor air. As for those civi! houses, both Benzene concentration and Tolu enc concentration were beyond the limitations of the indoor air quality standards in some houses; Benzene concentration was less than or equal to Toluene concentration in indoor air. Therefore, Tolu enc is released faster than Benzene in indoor air. This paper analyzed the reason of indoor Benzene and Toluene pollution, and brought forward some control measures.