盘锦市夏冬季PM2.5中碳组分污染特征及来源分析

于2016年7月和2017年1月采集盘锦市3个点位的PM_2.5样品，研究盘锦市夏冬季节PM_2.5中碳组分的特征与来源.结果表明：盘锦市夏季PM_2.5、有机碳（OC）和元素碳（EC）日均浓度分别为（46.14±12.70），（8.58±2.82）和（2.89±1.54）μg/m³；冬季分别为（91.01±43.51），（24.50±15.51）和（7.31±5.00）μg/m³.夏季开发区和第二中学2个采样点的OC与EC之间不具有线性相关性；冬季3个采样点OC、EC高度相关.采用最小相关系数法（MRS）估算SOC浓度，得到夏季SOC的浓度为4.65μg/m³，占OC总量的54.19%；冬季SOC浓度为8.42μg/m³，占OC总量的34.36%.通过比值分析和主成分分析得出盘锦市夏季PM_2.5中碳组分主要来源为汽油车尾气和燃煤排放；冬季PM_2.5中碳组分主要来源为机动车尾气、燃煤排放和生物质燃烧.

Pollution characteristics and sources of carbon components in PM2.5 during summer and winter in Panjin city

In order to study the characteristics and sources of carbon components in PM_2.5 during summer and winter in Panjin City, PM_2.5 samples were collected from three sites in July 2016 and January 2017. The results showed that the average concentrations of PM_2.5, Organic Carbon (OC) and Element Carbon (EC) were (46.14±12.70), (8.58±2.82) and (2.89±1.54) μg/m³ in summer, and (91.01±43.51), (24.50±15.51) and (7.31±5.00) μg/m³in winter, respectively. The correlations between OC and EC in development zone and NO.2 middle school were not significant in summer while OC was strongly correlated with EC at all sampling sites in winter. The SOC concentrations were calculated based on the Minimum R Squired method, which were 4.65μg/m³ in summer and 8.42μg/m³ in winter, accounting for 54.19% and 34.36% of the total OC, respectively. By means of ratio analysis and principal component analysis, the main sources of carbon components were gasoline vehicle exhaust and coal-fired emissions in summer, and vehicle exhaust, coal-fired emissions and biomass burning in winter.