南京工业区夏冬季节二次有机气溶胶浓度估算及来源解析

发布时间：2018-06-14 12:49

本文选题：VOCs + SOA浓度　；参考：《环境科学》2017年05期

【摘要】：采用2015年6月15日~7月15日及2015年12月16日~2016年1月15日期间GC5000在线气相色谱仪得到的挥发性有机物(volatile organic compounds,VOCs)数据、DRI-2001A热/光碳分析仪对膜采样分析得到的EC(elemental carbon)、OC(organic carbon)数据,使用气溶胶生成系数法(fractional aerosol coefficient,FAC)、EC示踪法及正矩阵因子分析(positive matrix factorization,PMF)对南京工业区二次有机气溶胶(secondary organic aerosol,SOA)浓度进行估算及来源解析.研究发现南京工业区SOA污染主要来源于芳香烃类物质,其对夏、冬季节SOA贡献率分别为80.39%、94.63%,主要贡献者为苯、甲苯、乙苯、二甲苯(benzene、toluene、ethylbenzene、xylene,BTEX);对南京工业区SOA浓度进行估算,得到夏季SOA浓度值为5.84~20.88μg·m~(-3),平均浓度为12.15μg·m~(-3),冬季为2.17~17.73μg·m~(-3),平均浓度为6.91μg·m~(-3),冬季SOA浓度平均水平明显低于夏季.SOA浓度值随风速及降水量的增大而减小;使用PMF受体模型对VOCs进行源解析分析得到夏季SOA污染主要来源于涂料使用、石油加工及石油化工源,SOA贡献值分别为0.65、0.21、0.18μg·m~(-3).冬季SOA污染主要来自于涂料使用,SOA贡献值为0.94μg·m~(-3).
[Abstract]:The volatile organic compounds (volatile organic compounds, VOCs) data obtained by GC5000 on-line gas chromatograph of GC5000 on June 15, 2015 ~7 and December 16, 2015 ~2016, EC (elemental carbon) obtained by DRI-2001A thermal / light carbon analyzer for membrane sampling analysis, using aerosol generation coefficient Fractional aerosol coefficient (FAC), EC tracer method and positive matrix factor analysis (positive matrix factorization, PMF) are used to estimate and analyze the concentration of two organic aerosols (secondary organic aerosol) in Nanjing industrial area. It is found that the main source of pollution in Nanjing industrial area is aromatics, summer and winter. The contribution rate of seasonal SOA was 80.39%, 94.63% respectively. The main contributors were benzene, toluene, ethylbenzene and xylene (benzene, toluene, ethylbenzene, xylene, BTEX). The concentration of SOA in Nanjing industrial area was estimated. The concentration of SOA in summer was 5.84~20.88 micron G. M~ (-3), and the average concentration was 6.9. The average concentration was 6.9. 1 mu g. M~ (-3), the average level of SOA concentration in winter is obviously lower than the increase of the.SOA concentration in summer with the increase of wind speed and precipitation. The source of SOA pollution in summer using PMF receptor model is mainly derived from the use of paint, petroleum processing and petrochemical sources, SOA contribution value is 0.65,0.21,0.18 mu g. The dyeing is mainly from the use of paints, and the SOA contribution is 0.94 mu g. M~ (-3).
【作者单位】：南京信息工程大学气象灾害教育部重点实验室气候与环境变化国际合作联合实验室气象灾害预报预警与评估协同创新中心中国气象局气溶胶与云降水重点开放实验室;杭州市环境监测中心站;
【基金】：中国科学院战略性先导科技专项(B类)(XDB05020206) 国家自然科学基金项目(91544229,41305135) 江苏省高校“青蓝工程”项目江苏省江苏高校优势学科建设工程项目(PAPD)
【分类号】：X513;X831

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