Sharma Atul Prakash, Tripathi B D
Pollution Ecology Research Laboratory, Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi 221005, India.
Environ Monit Assess. 2009 Feb;149(1-4):477-82. doi: 10.1007/s10661-008-0224-7. Epub 2008 Feb 15.
Biomonitoring of polycyclic aromatic hydrocarbons (PAHs) in the leaves of Calotropis gigantea R.Br. were performed at seven sites in the surrounding areas of a Thermal Power Plant (TPP), using the gas chromatography and mass spectrometry technique. The primary objective of the study was to monitor the degree of PAHs load in the nearby sites around TPP compared to distant sites. Total PAH (SigmaPAH) concentrations in the leaves ranged from 372.18 (at control site 7) to 4362.35 ng g(-1) d.w. (at highest polluted site 4). The concentration factors ranged from 2.65 to 11.72 for the sites located at 1 km to the point source and 1.0 to 7.08 for distant sites. The share of carcinogenic PAHs to the total PAHs differed with the site, ranging from 10.76% to 26.92%. The sites located closer to TPP have shown higher concentrations of medium and high molecular weight PAHs, which decreased gradually with the distance from the source. The total PAH burden at control site was dominated by the low and medium molecular weight PAHs compounds viz., naphthalene, acenaphthylene, acenaphthene, phenanthrene, fluoranthene, pyrene, chrysene, coronene., whilst at other sites medium and high PAHs viz., fluoranthene, pyrene, benzo (a) anthracene, chrysene, benzo (b) fluoranthene, benzo (e) pyrene and coronene showed the highest values. These results support the biomonitoring ability of Calotropis gigantea R.Br. leaves to monitor PAHs contamination.
采用气相色谱和质谱技术，对热电厂（TPP）周边地区七个地点的牛角瓜叶片中的多环芳烃（PAHs）进行了生物监测。该研究的主要目的是监测热电厂附近地区与远处地区相比PAHs的负载程度。叶片中总PAH（ΣPAH）浓度范围为372.18（对照点7）至4362.35 ng g(-1)干重（污染最严重的点4）。距离点源1公里处的地点浓度因子范围为2.65至11.72，远处地点为1.0至7.08。致癌PAHs占总PAHs的比例因地点而异，范围为10.76%至26.92%。距离热电厂较近的地点显示出较高浓度的中高分子量PAHs，其浓度随着与源的距离增加而逐渐降低。对照点的总PAH负担主要由低分子量和中分子量PAHs化合物主导，即萘、苊烯、苊、菲、荧蒽、芘、 Chrysene、晕苯，而在其他地点，中高分子量PAHs，即荧蒽、芘、苯并(a)蒽、 Chrysene、苯并(b)荧蒽、苯并(e)芘和晕苯显示出最高值。这些结果支持了牛角瓜叶片对PAHs污染进行生物监测的能力。
