Hoque Raza Rafiqul, Khillare P S, Agarwal Tripti, Shridhar Vijay, Balachandran S
Department of Environmental Science, Tezpur University, Tezpur, India.
Sci Total Environ. 2008 Mar 15;392(1):30-40. doi: 10.1016/j.scitotenv.2007.08.036. Epub 2007 Dec 11.
Benzene, toluene, ethylbenzene and xylene (BTEX) form an important group of aromatic Volatile Organic Compounds (VOCs) because of their role in the tropospheric chemistry and the risk posed by them to human health. Concentrations of BTEX were determined at different sampling points in the ambient air of Delhi in order to investigate their temporal and spatial distributions. Significant positive correlation coefficient (p<0.01) was found between inter-species concentrations at all the sampling locations. Inter-species ratio and Pearson's correlations indicate that gasoline vehicular exhaust could be the major source of BTEX in Delhi. The inter-species ratios exhibit clear seasonal variations indicating differential reactivity of the VOC species in different seasons. Xylenes were found the largest contributor to the ozone formation followed by toluene.
苯、甲苯、乙苯和二甲苯（BTEX）构成了一类重要的芳香族挥发性有机化合物（VOCs），因为它们在对流层化学中发挥作用，并且对人类健康构成风险。为了研究BTEX在德里环境空气中的时空分布，在不同采样点测定了其浓度。在所有采样地点的物种间浓度之间发现了显著的正相关系数（p<0.01）。物种间比率和皮尔逊相关性表明，汽油车辆尾气可能是德里BTEX的主要来源。物种间比率呈现出明显的季节性变化，表明VOC物种在不同季节的反应性不同。发现二甲苯是臭氧形成的最大贡献者，其次是甲苯。
