长沙市大气中总挥发性有机物分布特征、变化规律及污染对策研究

摘要

为调查长沙市大气中TVOC的分布特征及变化规律，研究其污染控制措施，按照相关标准和技术规范，在不同的功能区划和行政区划内合理布设12个监测点位，分季节采集样品，使用热脱附－气相色谱法进行检测，利用反距离权重插值和遥感解译等方法进行综合分析。结果表明：长沙市大气中苯与甲苯（ B／T）特征比值为0．58，汽车尾气是长沙市苯系物和TVOC的主要来源；长沙市不同的工业区TVOC浓度有显著差异，工业区合理布局，增加绿化面积，可以有效的降低TVOC浓度。%In order to investigate the distribution characteristics of total volatile organic compounds (TVOC)in Changsha, and to study its pollution control measures, samples were seasonally collected according to pertinent standards and technical specifications from 12 monitoring sites rationally distributed in various functional areas and administrative districts .Thermal Desorption -Gas Chromatography method was used for analysis, which followed by inverse distance weights(IDW)interpolation and remote sensing interpretation as comprehensive analysis.The results show that the ratio between Benzene and Toluene(B/T)in ambient is 0.58;automobile exhaust dominates xylene(BTEX)and TVOC in Changsha;concentration of TVOC varies significantly from industrial dis-tricts;concentration of TVOC can be effectively reduced by more rationally distributed industrial districts and increasing green area .