Hussam A, Alauddin M, Khan A H, Chowdhury D, Bibi H, Bhattacharjee M, Sultana S
Chemistry Department, MSN 3E2, George Mason University, Fairfax, VA 22030, USA.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2002 Aug;37(7):1223-39. doi: 10.1081/ese-120005982.
A solid phase microextraction (SPME) technique was applied for the sampling of volatile organic compounds (VOCs) in ambient air polluted by two stroke autorickshaw engines and automobile exhausts in Dhaka city, Bangladesh. Analysis was carried out by capillary gas chromatography (GC) and GC-mass spectrometry (MS). The methodology was tested by insitu sampling of an aromatic hydrocarbon mixture gas standard with a precision of +/-5% and an average accuracy of 1-20%. The accuracy for total VOCs concentration measurement was about 7%. VOC's in ambient air were collected by exposing the SPME fiber at four locations in Dhaka city. The chromatograms showed signature similar to that of unburned gasoline (petrol) and weathered diesel containing more than 200 organic compounds; some of these compounds were positively identified. These are normal hydrocarbons pentane (n-C5H2) through nonacosane (n-C29H60), aromatic hydrocarbons: benzene, toluene, ethylbenzene, n-propylbenzene, n-butylbenzene, 1,3,5-trimethylbenzene, xylenes, and 1-isocyanato-3-methoxybenzene. Two samples collected near an autorickshaw station contained 783000 and 1479000 microg/m3 of VOCs. In particular, the concentration of toluene was 50-100 times higher than the threshold limiting value of 2000 microg/m3. Two other samples collected on street median showed 135000 microg/m3 and 180000 microg/m3 of total VOCs. The method detection limit of the technique for most semi-volatile organic compounds was 1 microg/m3.
采用固相微萃取（SPME）技术对孟加拉国达卡市受二冲程自动人力车发动机和汽车尾气污染的环境空气中的挥发性有机化合物（VOCs）进行采样。通过毛细管气相色谱（GC）和GC-质谱（MS）进行分析。该方法通过对芳烃混合气体标准进行现场采样进行测试，精度为±5%，平均准确度为1 - 20%。总VOCs浓度测量的准确度约为7%。通过将SPME纤维暴露在达卡市的四个地点来收集环境空气中的VOCs。色谱图显示出与未燃烧汽油（汽油）和含有200多种有机化合物的风化柴油相似的特征；其中一些化合物得到了明确鉴定。这些是正戊烷（n-C5H2）至正二十九烷（n-C29H60）的正构烃、芳烃：苯、甲苯、乙苯、正丙苯、正丁苯、1,3,5-三甲苯、二甲苯和1-异氰酸酯-3-甲氧基苯。在一个自动人力车站附近采集的两个样本中VOCs含量分别为783000和1479000微克/立方米。特别是，甲苯浓度比2000微克/立方米的阈限值高50 - 100倍。在街道中间带采集的另外两个样本显示总VOCs含量分别为135000微克/立方米和180000微克/立方米。该技术对大多数半挥发性有机化合物的方法检测限为1微克/立方米。
