长沙市某区域大气PM_(2.5)中多环芳烃的污染特征分析  

Pollution characteristics of PAHs in PM_(2.5) at a district of Changsha

作　　者：苏莎[1] 杨珍[1] 汪琼[1] 李乐[2] SU Sha;YANG Zhen;WANG Qiong;LI Le(Changsha Center for Disease Control and Prevention,Changsha,Hunan 410000,China;School of Public Health,University of South China,Hengyang,Hunan A21001,China)

机构地区：[1]长沙市疾病预防控制中心,湖南省长沙市410000 [2]南华大学公共卫生学院,湖南省衡阳市421001

出　　处：《中南医学科学杂志》2021年第4期393-396,共4页Medical Science Journal of Central South China

基　　金：湖南省重点研发计划(2018SK2029)。

摘　　要：目的了解长沙市某区域大气PM_(2.5)中多环芳烃的污染特征和危害。方法采集大气PM_(2.5)样品共84个。用高效液相色谱法测定样品中多环芳烃质量浓度,分析不同时期多环芳烃污染特征,利用特征比值法识别其主要来源。结果研究区域多环芳烃(PAHs)污染物以6环化合物为主,16种PAHs总质量浓度(∑16PAHs)年均值为(9.47±9.68)ng/m^(3),中位数为5.13 ng/m^(3),其中冬季∑16PAHs中位数最高,夏季最低。苯并[a]芘(BaP)年均质量浓度低于GB3095—2012环境空气质量标准(年平均1 ng/m^(3)),BaP 24 h平均质量浓度超过标准质量浓度限值(2.5 ng/m^(3))仅2天,超标2.38%。特征比值法判断出PAHs的主要来源为机动车尾气。结论长沙市某区域大气PM_(2.5)中PAHs污染水平冬季高于其他季节,提倡绿色低碳出行。Aim In order to understand the pollution characteristics and hazards of PAHs in PM_(2.5) at a certain district of Changsha city.Methods 84 PM_(2.5) samples were collected.The concentrations of PAHs in the samples were determined by HPLC,the pollution characteristics of PAHs in different periods were analyzed,and the main sources were identified by feature ratio method.Results The PAHs pollutants in the study area were mainly 6-ring compounds,the average annual concentration of 16 kinds of PAHs(∑16PAHs)was(9.47±9.68)ng/m^(3),and the median value was 5.13 ng/m^(3).The highest median value of∑16PAHs in winter was the higher,summer is the lowest.The average annual concentration of benzo(a)pyrene(BaP)was lower than the GB3095-2012 ambient air quality standard(annual average of 1 ng/m^(3)),and the 24-hour average concentration of BaP exceeded the standard concentration limit(2.5 ng/m^(3))for only 2 days,exceeding 2.38%.The main source of PAHs was automobile exhaust by feature ratio method.Conclusions The pollution level of PAHs in PM_(2.5) at a certain district of Changsha in winter is higher than that in other seasons,Green and low-carbon travel should be strongly advocated.

关 键 词：PM_(2.5) 多环芳烃 长沙市 污染特征 

分 类 号：R122.2[医药卫生—环境卫生学]