贵阳市秋冬季Pm2.5与PM10中黑碳浓度特征及来源分析  

Characteristics and source analysis of black carbon in PM2.5 and PM10 of Guiyang City,China during autumn-winter period

作　　者：敖娅 董娴[1,2] 范雪璐 金倩 陈卓 AO Ya;DONG Xian;FAN Xuelu;JIN Qian;CHEN Zhuo(School of Chemistry and Material Science,Guizhou Normal University,Guiyang Guizhou 550001;Guiyang Key Laboratory of Atmospheric Fine Particles and Air Pollution Chemistry,Guiyang Guizhou 550001)

机构地区：[1]贵州师范大学化学与材料科学学院,贵州贵阳550001 [2]贵阳市大气细粒子和大气污染化学重点实验室,贵州贵阳550001

出　　处：《环境污染与防治》2020年第11期1345-1349,1354,共6页Environmental Pollution & Control

基　　金：国家自然科学基金资助项目(No.21767007);贵州省科学技术基金资助项目(黔科合基础〔2018〕1111);贵州师范大学2017年度学术新苗培养及创新探索专项(黔科合平台人才〔2017〕5726)。

摘　　要：于2017年9月至2018年2月,昼夜连续采集贵阳市大气Pm2.5和PM 10样品,利用黑碳仪对样品中的黑碳浓度进行连续监测,探讨气象参数对黑碳浓度的影响,并利用混合单粒子拉格朗日综合轨迹(HYSPLIT)模型分析其来源。结果表明,贵阳市秋冬季Pm2.5中黑碳昼、夜质量浓度分别为1.27~6.87、1.28~10.17μg/m^3,平均值分别为3.21、3.78μg/m^3;PM 10中黑碳昼、夜质量浓度分别为1.62~8.92、1.73~11.94μg/m^3,平均值分别为3.97、4.50μg/m^3,表明夜间变化范围较昼间大,且平均浓度高于昼间。秋季Pm2.5、PM 10中黑碳平均质量浓度分别为3.40、3.56μg/m^3,占比(质量分数)分别为6.18%和5.60%,冬季Pm2.5、PM 10中黑碳平均质量浓度分别为3.56、5.20μg/m^3,占比分别为5.29%和4.59%。黑碳主要富集在Pm2.5中,且呈冬季高、秋季低的季节变化特征。黑碳浓度与大气Pm2.5和PM 10浓度呈较好正相关关系,R分别为0.850和0.870(P<0.01),其变化趋势明显受气压、风速和相对湿度等的影响。后向轨迹分析表明,贵州省本地及重庆市东南部气流对贵阳市秋冬季黑碳浓度贡献较大。By using aethalometer,the concentration of black carbon in Pm2.5 and PM 10 was continuously detected in Guiyang City,from September 2017 to February 2018.The effects of meteorological parameters on black carbon mass concentration were explored,and the source was analyzed by the HYSPLIT model.Results showed that the daytime and nighttime black carbon concentration in Pm2.5 during the detection period was mainly range in 1.27-6.87 and 1.28-10.17μg/m^3,and the average concentration was 3.21,3.78μg/m^3,respectively.For black carbon mass concentration in PM 10,its daytime variation range was 1.62-8.92μg/m^3,with a mean value of 3.97μg/m^3,and its nighttime variation range was 1.73-11.94μg/m^3,with a mean value of 4.50μg/m^3,indicating that the nighttime variation range was larger than daytime,and the average concentration of daytime black carbon was slightly below night time black carbon.In autumn,the average mass concentration of black carbon in Pm2.5 and PM 10 were 3.40,3.56μg/m^3,and the proportion(mass fraction)of black carbon in Pm2.5 and PM 10 were 6.18%and 5.60%,respectively.However,in winter,the average mass concentration of black carbon in Pm2.5 and PM 10 was 3.56,5.20μg/m^3,and the proportion of black carbon in Pm2.5 and PM 10 was 5.29%and 4.59%,indicating that black carbon was mainly concentrated in Pm2.5 with high in winter and low in autumn.The black carbon concentration had a good positive correlation with Pm2.5 and PM 10 concentrations,with R of 0.850 and 0.870(P<0.01),respectively.Moreover,the variation trend of black carbon concentration was also affected by pressure,wind speed,relative humidity and so on.Backward trajectory analysis results showed that the black carbon concentration of Guiyang City was mainly affected by air masses from Guizhou Province and Southeast Chongqing City in autumn and winter.

关 键 词：PM2.5 PM 10 黑碳 污染特征 来源 

分 类 号：X513[环境科学与工程—环境工程]