罐采样-GC/MS法测定环境空气中挥发性有机物

采用SUMMA罐采样,空气预浓缩与气相色谱/质谱联用技术,建立了39种常见挥发性有机物的分析方法。选取攀枝花市不同功能区的5个测点,采集了4个季度的环境空气样品220个,定性检出挥发性有机物54种,其中烃类占24%,卤代烃类占52%,含氧化合物占22%,其它化合物占2%。苯系物的检出率最高。定量的挥发性有机物最大浓度和平均浓度最高的项目均为苯,平均浓度4.59μg/m3,最大浓度29.8μg/m3。苯系物时间分布呈现出旱季高,雨季低的特点;日变化特征为早晨最高,整体呈下降趋势。

Determination of VOCs in Ambient Air by GC/MS with Canister Sampling

This article had established analysis method of 39 volatile organic compounds （VOCs） by air pre-concentration and gas chromatography/mass spectrometry technology,and had collected 220 atmospheric samples in four seasons from five different functional areas in Panzhihua.54 species of VOCs were detected by qualitative detectionand mainly were hydrocarbons,halogenated hydrocarbons,oxygen-containing compounds and other compounds,which accounted for 24％,52％,22％,and 2％ of the total species respectively.BTEX had the highest detection rate.The biggest quantitative concentration and the highest average concentration of VOCs were benzene with the average concentration of 4.59μg/m3,and the maximum concentration was 29.8μg/m3.The BTEX concentration distribution of the time was high in dry season,low in rainy season; the daily concentration variation characteristics were highest in the morning and with downward trend as a whole.