万州城区PM_(2.5)中有机碳与元素碳污染特征  

Pollution Characteristics of Organic and Elemental Carbon in PM_(2.5) at Wanzhou

作　　者：黄怡民 付川 张六一 覃小莉 张琪晨 吴炳煜 

机构地区：[1]三峡库区水环境演变与污染防治重庆高校市级重点实验室,重庆404000

出　　处：《重庆师范大学学报（自然科学版）》2015年第5期62-67,共6页Journal of Chongqing Normal University:Natural Science

基　　金：三峡库区水环境演变与污染防治重庆高校市级重点实验室开放基金项目(No.WEPKL2012QN-04);重庆市万州区科委项目(No.201303049);重庆三峡学院2013年度大学生创新性实验计划项目

摘　　要：为了解重庆万州区PM2.5中碳质气溶胶的污染特征,于2012-2013年分4个季节采集了PM2.5样品,并分析了其中有机碳（OC）和元素碳（EC）的浓度。结果显示,在采样期间,万州区PM2.5中OC和EC的年平均质量浓度分别为29.72μg·m-3和8.42μg·m-3,OC和EC浓度之和达PM2.5的27.25%。OC浓度的季节变化趋势由高到低分别为冬季、秋季、春季和夏季,EC在冬季浓度最高,其他季节浓度变化不大。OC和EC在4个季节都有较好的相关性（r为0.67-0.84）,其中,冬季相关性（r=0.84）最高,秋季相关性（r=0.67）最差,这与污染物来源复杂有关。应用OC/EC比值法对二次有机碳（SOC）进行估算,SOC年平均浓度为13.79μg·m-3,占OC含量的46.72%,冬季SOC的浓度远高于其他季节,冬季较高的OC排放及较低的大气扩散能力利于碳气溶胶中SOC的生成。The pollution characteristics of organic carbon （OC） and elemental carbon （EC） in PM2.5 was investigated at Wanzhou dis-trict of Chongqing. PM2. s was collected during four season-representative months in 2012--2013, which OC and EC in the sampleswere analyzed. The results showed that the annual mass concentration of OC and EC in PMz. swere 29.72 and 8.42 μg ·m 3. Thesum of OC and EC concentrations accounted for 27.25% of the mass of PM2.s. The seasonal average concentrations of OC levelsranked by the order of winter〉 autumn〉 spring〉 summer, while the EC concentrations were highest in winter and had the samelevels in other seasons. Strong correlations （r ranged from 0.67 to 0.84） between OC and EC was found in all seasons, with thehighest correlation coefficients in the winter （r=0.84） and the lowest in autumn （r=0.67）, indicating that the pollutant sources inautumn was more complicated. The minimum OC/EC ratio method, which relied mainly on ambient measurements of OC and EC,had been used to estimate the secondary organic carbon （SOC） formation. The annual average of SOC concentration in Wanzhouwere 13.79 btg· m-3 , accounting for 46.72% of OC. Due to high OC levels and weaker dispersal ability of atmosphere, SOC con-centrations during winter were much higher than other seasons.

关 键 词：PM2.5 有机碳 元素碳 二次有机碳 

分 类 号：X513[环境科学与工程—环境工程]