沈阳市环境空气PM_(2.5)中有机碳、元素碳的污染特征研究  

作　　者：李晶[1] 曲健[1] 李哲 韩艳玉[1] 王帅[1] 祝琳琳 

机构地区：[1]沈阳市环境监测中心站环境保护部大气有机污染物监测分析重点实验室,辽宁沈阳110169

出　　处：《环境保护与循环经济》2018年第1期50-54,共5页environmental protection and circular economy

基　　金：沈阳市科技计划项目(F16-156-9-00)

摘　　要：通过采集沈阳市环境空气不同时期PM_(2.5)样品,测定其中有机碳(OC)和元素碳(EC)含量,研究采暖期、非采暖期环境空气PM_(2.5)中OC,EC的污染特征。结果表明,沈阳市采暖期PM_(2.5)中OC,EC的含量高于非采暖期,而且采暖期OC,EC在PM_(2.5)中所占比重较高;采暖期PM_(2.5)中EC和OC的相关系数R是0.75,非采暖期为0.58;采暖期与非采暖期PM_(2.5)中SOC浓度分别为5.87μg/m3与3.92μg/m3,占OC含量的32.95%与50.05%。沈阳市采暖期OC和EC存在一致或者相似来源,采暖期OC和EC主要来源于柴油和汽油车尾气排放及燃煤排放,而非采暖期主要来自柴油和汽油车尾气排放,非采暖期大气光化学活性较高,二次污染源的贡献增强。The PM2.5 samples were collected during different period in Shenyang city. OC and EC were measured to research the pollution characteristics of OC and EC in PM2.5 during the heating season and non-heating season. The results indicated that the concentration of OC and EC were obviously higher in heating period compared with those in non-heating period. The mass fraction of OC and EC in PMz5 was higher in heating period; the correla- tion between OC and EC in PM2.5 was 0.75 in heating period and 0.58 in non-heating period; the mass concentra- tions of SOC in PM2.5 were 5.87 μg·m^-3 and 3.92 μg·m^-3 and accounted for 32.95% and 50.05% of OC mass con- centrations in heating period and non-heating period, respectively. It was suggested that OC and EC had consistent or similar sources in heating period. The main origins of OC and EC in heating period were automobile ex- haust fumes and coal combustion while those in non-heating period were automobile exhaust fumes. Moreover, the activity of atmospheric photochemical processes and the contribution of secondary transformation were higher in non-heating period.

关 键 词：环境空气 PM2.5 有机碳 元素碳 沈阳 

分 类 号：X513[环境科学与工程—环境工程]