Distribution Features of Alkanes in TSP of Taiyuan City and Its Environmental Significanee

Key words: 
• TSP alkane /
• source of pollutant /

Abstract: An analysis is made about alkanes in TSP in Taiyuan city by GC-MS and GCC-MS.The result shows the following distribution features of ulkanes in TSP:There is an app+rent difference Letween winter and summer,i. e. distribution feature in winter takes the form of single-peak-group normal distribution,from lower carbon numbers to higher carbon numbers,high peak zone in the middle and lower peak zones of two ends.The maximum carbon number is C₂₃. Starting from C₂₆,odd-number carbon superiority is not apparnet. During the non-heating period the feature of alkane distribution:a normal distribution peak group from lower cabron numbers to higher carbon numbers to higher carbon numbers,i.e.C₂₄-C₂₁;from C₂₁-C₂₂,another normal distribtution peak group takes the from of twin-peak group distribution,having maximum carbon number at the highest peak C₂₉. After C₂₆ odd-number superiority is relatively apparent. There is sharp difference between different functional zones constituted by an alkanse series carbon isutapes,i. e. industrial area of Taiyuan steel-22.6‰,commercial residential area of Taiuan No. 4 lane-27.9‰,chemical industrial area of chemical fertilizer plant-32.98‰.The above distribution feature is closely related to the source of pollutants. The pollutants in the heating period mainly come from fossil fuels,dust and the products from combustion. The situation is mainly due to coal for winter heating,coal for industrial production consumption and coal mine production. Besides, Taiyuan city's affection by winter's reverse temperature is comparatively big. The air stability is big. The air exchange between the down town and the outskirts and the boundary villages is difficult. Besides,the germs in winter are not so active and a few of the current organic matters such as high-class plants, etc. enter atmosphere. The source of organic pollutants taken from the samples in summer ; except for mainly from fossil fuels,few from germs and current organic matter,e. g. High-class plants,the main reason is that in summer reverse temperature phenomea relatively small and the air stability gets smaller. It is easy for the air in outskirts and villages to disperse towards the city to make the curret organic matters such as high-class plants,etc. Be transported to down town and to make the different functional areas of alkanes distribution have less difference. Ralatively speaking,the organic pollution in Taiyuan city on the whole is severely influenced by the residues coming from combusted fossil fuels,it is only in summer that a few natural pollution sources exist. Concretely speaking, in different functional area : The industrial area of Taiyuan steel is mainly polluted by coal. the pollution constituents in the residential area in Taiyuan No. 4 lane is complex,i. e.products from combusted coal automobile tail-gas exhaustion and flying dust drained from daily life. The pollutants in the chemical industrial area of No. 1 power plant mainly come from chemical pollution,coal combustion and current high-class organic matters in the outskirts.