2022年赤峰市中心城区大气PM_(2.5)及金属和类金属浓度与传输来源分析

Analysis of ambient PM_(2.5) and its bounded metal and metalloid concentrations and transmission sources in the central urban area of Chifeng City,China,2022

目的 了解2022年赤峰市大气PM_(2.5)中主要金属和类金属(以下统称“金属”)污染特征分析、解析其来源,并分析污染物输送路径。方法 2022年1—12月,每月10—16日在主城区进行大气采样,分析大气中PM_(2.5)、金属浓度特征分布,采用HYSPLIT轨迹模式聚类分析方法识别大气污染物的输送路径,通过主成分分析法解析赤峰市PM_(2.5)金属污染物来源。结果 赤峰城区PM_(2.5)日平均浓度M(P25,P75)为26.0(19.2,36.4)μg/m^(3),金属日均浓度为0.60(0.05,3.64)ng/m^(3)。后向轨迹聚类分析结果显示来自西北方向气团占所有气团来向比例最高,潜在源贡献区分布于内蒙古自治区西部及陕西省中部、华北地区南部。主成分分析发现大气PM_(2.5)中金属主要来源于工业生产、燃煤、扬尘等。结论 赤峰市大气PM_(2.5)中金属、类金属主要来源可能为工业生产、燃煤、扬尘等污染源,应重点关注内蒙古自治区西部及陕西省中部、华北地区南部地区空气治理。

Objective To analyze the characteristics of major metal and metalloid pollution in atmospheric fine particulate matter(PM_(2.5))and its sources in Chifeng City,China,2022,and analyze the transport path of particulate matters.Methods From January to December 2022,atmospheric sampling was conducted in the main urban area from days 10 to 16 every month to analyze the charac-teristic distribution of atmospheric PM_(2.5) and metal concentrations.A HYSPLIT trajectory pattern clustering analysis was used to identi-fy the transport path of atmospheric pollutants,and a principal component analysis was used to analyze the sources of metal pollutants in PM_(2.5) in Chifeng City.Results The daily average PM_(2.5) concentration M(P25,P75)in Chifeng’s urban area was 26.0(19.2,36.4)μg/m^(3),and the daily average metal concentration was 0.60(0.05,3.64)ng/m^(3).The results of the backward trajectory clus-tering analysis showed that the air masses from the northwestern direction accounted for the highest proportion of air masses from all di-rections.The potential source contribution area was distributed in the western part of Inner Mongolia Autonomous Region,the central part of Shaanxi Province,and the southern part of North China.It was found by the principal component analysis that metals in atmos-pheric PM_(2.5) were mainly derived from industrial production,coal combustion,and dust.Conclusion The main sources of metals and metalloids in atmospheric PM_(2.5) in Chifeng City may be industrial production,coal combustion,dust,and other sources of pollution.Attention should be paid to air pollution control in the western part of the Inner Mongolia Autonomous Region,the central part of Shaanxi Province,and the southern part of North China.