摘要
为研究青岛市冬季大气PM_(2.5)中正构烷烃的浓度水平、分子组成以及来源,于2020年1月10—23日在青岛市崂山区采集城市地区大气PM_(2.5)样品,通过气相色谱-质谱(GC-MS)进行定量分析得到26种正构烷烃,并对正构烷烃的污染特征及来源进行详细分析。结果表明:正构烷烃浓度为59.2~429.2 ng/m^(3),平均浓度为(230.9±111.7)ng/m^(3),其中正二十四烷烃是浓度最高的单体物种,浓度为49.63 ng/m^(3)。依据GB 3095—2012《环境空气质量标准》PM_(2.5)二级浓度限值,采样期间分别有8天污染天和6天清洁天,污染天和清洁天正构烷烃的浓度分别为(283.7±93.6)和(160.5±82.1)ng/m^(3)。污染天和清洁天正构烷烃碳数分布相似,主峰碳为C22,次峰碳为C24。污染天和清洁天正构烷烃的碳优势指数(CPI、CPI1和CPI2)分别为0.91、0.81、1.19和0.98、0.84、1.38,植物蜡贡献率分别为6.67%和19.31%,表明人为排放源是青岛市冬季正构烷烃的主要来源。主成分分析结果表明,青岛市冬季正构烷烃主要来自人为排放源(煤炭燃烧、车辆尾气排放),植物排放源的贡献较小。潜在源分析结果表明,正构烷烃主要来自西北方向的长距离传输,低碳数正构烷烃和高碳数正构烷烃的潜在源分布基本一致。
To investigate mass concentrations,molecular compositions and sources of n-alkanes in PM_(2.5)in Qingdao during the winter,PM_(2.5)samples were collected from Laoshan District,Qingdao from January 10 to 23,2020.Twenty-six kinds of n-alkanes(C11-C36)were determined through quantitative analysis by gas chromatography-mass spectrometry(GC-MS),and the pollution characteristics and sources of n-alkanes were analyzed in detail.The results showed that the concentration of total n-alkanes was(230.9±111.7)ng/m^(3),with the average concentration ranging from 59.2-429.2 ng/m^(3).C24was the monomer species with the highest concentration,which concentration was 49.63 ng/m^(3).According to the secondary concentration limit of PM_(2.5)of the National Ambient Air Quality Standards of China(NAAQS),the sampling period was divided into 8 polluted days and 6clean days.The concentrations of n-alkanes on polluted and clean days were(283.7±93.6)ng/m^(3)and(160.5±82.1)ng/m^(3),respectively.The carbon number distribution of n-alkanes on polluted days and clean days was similar.The main peak carbon(Cmax)was C22and the secondary peak carbon was C24.CPI,CPI1 and CPI2 values of n-alkanes on polluted and clean days were 0.91,0.81,1.19 and 0.98,0.84,1.38,respectively,and%WaxCn was 6.67%and19.31%,respectively,indicating that anthropogenic emissions were the main source of n-alkanes in Qingdao during the winter.Principal component analysis(PCA)results showed that the n-alkanes in Qingdao during the winter mainly came from anthropogenic emission sources(coal combustion,vehicle exhaust emissions),and the contribution of plant emission sources was small.The potential source analysis results showed that the potential source distributions of low carbon number n-alkanes and high carbon number n-alkanes were basically the same,mainly from the long-distance transmission in the northwest direction.
作者
温会英
王少博
张敬巧
刘锐泽
郭天锋
王涵
张文杰
王淑兰
WEN Huiying;WANG Shaobo;ZHANG Jingqiao;LIU Ruize;GUO Tianfeng;WANG Han;ZHANG Wenjie;WANG Shulan(Chinese Research Academy of Environmental Sciences)
出处
《环境工程技术学报》
CAS
CSCD
北大核心
2023年第1期105-113,共9页
Journal of Environmental Engineering Technology
基金
大气重污染成因治理与攻关项目(DQGG0304)。
