摘要
[目的]监测呼和浩特市大气颗粒物PM_(2.5)质量浓度(下称浓度),并分析样品中多环芳烃(PAHs)的污染特征,为呼和浩特市大气污染相关研究提供科学数据。[方法]于2015年1—12月在呼和浩特市回民、赛罕两区采集PM_(2.5)样品,分析样品中16种优先控制PAHs的浓度特征与污染状况,并采用特征分子比值法对PAHs的来源进行定性分析。[结果]呼和浩特市回民、赛罕两区PM_(2.5)浓度范围分别为10.0~290.0μg/m^3和10.0~170.0μg/m^3,全年平均浓度分别为90μg/m^3(95%CI:70.0~100.0)和60.0μg/m^3(95%CI:50.0~70.0),回民区PM_(2.5)浓度总体高于赛罕区,差异有统计学意义(P<0.05)。两区PM_(2.5)浓度有季节变化趋势,即冬季>秋季>春季>夏季。对两个监测地区PM_(2.5)中PAHs进行测定,发现回民、赛罕两区PM_(2.5)中PAHs浓度范围分别是0.36~217.0 ng/m^3和0.36~131.4 ng/m^3,全年平均浓度分别为43.42 ng/m^3(95%CI:30.0~56.8)和23.40 ng/m^3(95%CI:13.6~29.8);两区PAHs中浓度排在前三位的成分一致,依次为萘、苯并[b]荧蒽和二苯并[a,h]蒽,苯并[a]芘浓度分别为2.32 ng/m^3和1.46 ng/m^3。特征分子比值分析表明,回民区4种特征分子比值荧蒽/(荧蒽+芘)、蒽/(蒽+屈)、苯并[a]芘/苯并[g,h,i]苝、蒽/(蒽+菲)分别为0.04、0.49、2.32和0.38,赛罕区分别为0.14、0.36、24.3和0.34。[结论]呼和浩特市大气PM_(2.5)中PAHs浓度较高,呈现混合污染特点,燃煤和机动车排放是PAHs的主要来源。
[Objective] To monitor the concentrations of atmospheric fine particulate matters （PM2.5） in Hohhot City, and analyze the distribution characteristics of polycyclic aromatic hydrocarbons （PAHs） in the samples collected, so as to provide scientific evidence for the research on the air pollution of Hohhot.[Methods] PM2.5 samples were collected from Huimin District and Saihan District of Hohhot from January to December 2015. The concentrations and pollution characteristics of 16 pollution-control-prioritized PAHs were analyzed. A qualitative analysis of PAHs sources was performed using characteristic molecular ratio.[Results] The PM2.5 concentrations ranged 10.0-290.0 μg/m3 in Huimin District and 10.0-170.0 μg/m3 in Saihan District, the annual average concentrations of PM2.5 were 90 μg/m3 （95%CI：70.0-100.0） and 60.0 μg/m3 （95%CI：50.0-70.0）, respectively, and the average concentration of PM2.5 in Huimin District was higher than that in Saihan District （P 〈 0.05）. PM2.5 concentrations showed a seasonal variation in both districts：winter 〉 autumn 〉 spring 〉 summer. The PAHs concentrations ranged 0.36-217.0 ng/m3 with an average of 43.42 ng/m3 （95%CI：30.0-56.8） in Huimin District, and the concentrations ranged 0.36-131.4 ng/m3 with an average of 23.40 ng/m3 （95%CI：13.6-29.8） in Saihan District. The leading three components of PAHs in PM2.5 were naphthalene, benzo[b]fluoranthene, and dibenz[a, h]anthracene for the two districts; in particular, the benzo [a] pyrene concentrations were 2.32 ng/m3 for Huimin District and 1.46ng/m3 for Saihan District. According to the results of characteristic molecular ratio analysis, the characteristic molecular ratios of fluoranthene/（fluoranthene＋pyrene）, anthracene/（anthracene＋chrysene）, benzo（a）pyrene/benzo（g, h, i）pyrene, and anthracene/（anthracene＋phenanthrene） were 0.04, 0.49, 2.32, and 0.38, respectively, for Huimin District, and 0.14, 0.36, 24.3, and 0.34, respectively, for Saihan District.[Conclusion] The concentration of PAHs in PM2.5 is high in Hohhot City, displaying a mixed pollution pattern. Coal combustion and motor vehicle emissions are the main sources of PAHs.
出处
《环境与职业医学》
CAS
CSCD
北大核心
2017年第5期410-414,共5页
Journal of Environmental and Occupational Medicine
关键词
呼和浩特
PM2.5
多环芳烃
季节变化
污染特征
Hohhot
PM2.5
polycyclic aromatic hydrocarbons
seasonal variation
pollution characteristic
