摘要
2011年1月至12月在乌鲁木齐市区用膜采样法采集了大气PM_(2.5)和PM_(2.5~10)样品,并利用热光/碳分析仪测定了其中有机碳(OC)和元素碳(EC)的质量浓度.通过OC与EC的粒径分布特征、比值和相关性的分析,初步分析了乌鲁木齐市大气可吸入颗粒物中碳质气溶胶污染特征,并用OC/EC比值法估算了二次有机碳(SOC)的浓度.结果表明,PM_(2.5)和PM_(2.5~10)的年平均质量浓度分别为92.8μg/m^3和64.7μg/m^3.PM_(2.5)中OC和EC的年平均浓度分别为13.85μg/m^3和2.38μg/m^3,PM_(2.5~10)中OC和EC的年平均浓度分别为2.63μg/m^3和0.57μg/m^3.OC和EC四季变化趋势基本一致,季浓度最高.碳组分主要集中于PM_(2.5)中,OC/EC比值范围为3.62~11.21.夏季和秋季的PM_(2.5)和PM_(2.5~10)中OC和EC的相关性较好(R2>0.65).估算得出的PM_(2.5)和PM_(2.5~10)中SOC的估算浓度为2.31~11.98μg/m^3和0.38~1.49μg/m^3.
Filter-based PM2.5-10 and PM2.5 samples were collected at an urban site in Urumqi during January-December 2011, and analyzed for the organic carbon（OC） and elemental carbon（EC） mass concentrations by a thermal/optical carbon analyzer. The characteristics of carbonaceous aerosols in Urumqi were preliminarily investigated with the size distribution of OC and EC, OC/EC ratios and their correlations; and the mass concentrations of secondary organic carbon（SOC） were estimated by using the OC/EC ratio or EC-tracer method. The results showed that PM2.5 and PM2.5-10 had annual average mass concentrations of 92.8μg/m^3 and 64.7μg/m^3, respectively; while OC and EC had annual average mass concentrations of 13.85μg/m^3 and 2.38μg/m^3 in PM2.5, and 2.63μg/m^3 and 0.57μg/m^3 in PM2.5-10, respectively. OC and EC in PM2.5 and PM2.5-10 demonstrated similar seasonal variations with the highest values observed in winter.Carbonaceous aerosols were mainly concentrated in PM2.5. OC/EC ratios ranged from 3.67 to 11.21. Good linear correlations were found between OC and EC in summer and autumn（R20.65）. Estimated SOC in PM2.5 and PM2.5-10 ranged 2.31-11.98μg/m^3 and 0.38-1.49μg/m^3, respectively.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2016年第2期356-362,共7页
China Environmental Science
基金
新疆维吾尔自治区自然科学基金资助项目(2012211A019)
作者简介
王果（1993-），男，四川南充人，硕士研究生，主要从事大气颗粒物监测及评价．
责任作者，教授，dilnurt2000@126．com
