兰州市大气OPAHs污染特征及潜在来源分析

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摘要对兰州市冬季（2016-12-01~07）和夏季（2017-08-03~10）大气气相和颗粒相（PM_1.0、PM_2.5和PM₁₀）中含氧多环芳烃（OPAHs）进行观测，结果显示：Σ₈OPAHs （气相+颗粒相）的浓度范围为1.83~19.28ng/m³，平均浓度为（6.45±3.43） ng/m³.冬季是夏季的2.06倍.冬季颗粒相OPAHs在2.5~10和<1.0μm粒径段均具有较大占比，而夏季则主要赋存于PM_1.0中.9-芴酮（9-FLU）、9，10-蒽醌（9，10-ANT）和苯并蒽酮（BZA）为OPAHs中最主要的几种单体物质，其占比为51.8%~94.9%.气粒分配机制研究结果表明：OPAHs在气粒两相间的分配以吸收机制为主导.基于浓度权重轨迹分析法（CWT）对兰州市大气中OPAHs的潜在污染源区进行了分析，发现其潜在污染源区在冬季主要位于当地及其西北方向位于新疆和青海境内的部分地区，而夏季则主要位于该研究区域的东南方向（定西市、天水市等）和东北方向（宁夏回族自治区中卫市）.

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	李宏宇
	李沛祺
	黄娟
	杨兆莉
	刘鹏
	张丽园
	马海波
	毛潇萱
	高宏
	黄韬

关键词 ：兰州市, 含氧多环芳烃(OPAHs), 污染特征, 气粒分配机制, 来源, PM_2.5

Abstract：A field campaign was conducted to monitor oxygenated polycyclic aromatic hydrocarbons (OPAHs) concentrations in gas phase and particulate matter (PM_1.0, PM_2.5 and PM₁₀) in a winter week (December 1^st~7^th, 2016) and a summer week (August 3^rd, 2017) across the Lanzhou City. The results showed that total gaseous + particulate concentration of Σ₈OPAHs ranged from 1.83 to 19.28ng/m³ with a mean of (6.45 ±3.43) ng/m³. The atmospheric Σ₈OPAHs level in the winter week was 2.06 times that in the summer week. Particle-bound OPAHs contributed to a large proportion to both 2.5~10 and <1.0μm size ranges in the winter week, whereas in the summer week, OPAHs were generally detected in PM_1.0. 9-Fluorenone (9-FLU), 9,10-Anthraquinone (9,10-ANT) and Benzanthrone (BZA) were the most abundant OPAHs, accounting for 51.8%~94.9% of the total, from which the absorption mechanism was thought to dominate the gas-particle partitioning of sampled OPAHs. The results from a concentration weighted trajectory (CWT) model reveal that the OPAHs concentration in Lanzhou was significantly affected by local emission sources in the winter week, followed by long-distance atmospheric transport from the northwest of Lanzhou, covering the part of Xinjiang and Qinghai Provinces. In the summer week, the OPAHs mainly presented in the southeast of Lanzhou, such as Dingxi and Tianshui and the northeast, such as Zhongwei in Ningxia Hui Autonomous Region.

Key words： Lanzhou city oxygenated polycyclic aromatic hydrocarbons (OPAHs) pollution characteristics gas-particle partitioning mechanism pollution source PM_2.5

收稿日期: 2022-01-12

PACS:

X513

基金资助:国家自然科学基金资助项目（42177351）

通讯作者: 高宏,教授,honggao@lzu.edu.cn E-mail: honggao@lzu.edu.cn

作者简介: 李宏宇(1992-),女,山西吕梁人,兰州大学博士研究生,研究方向为持久性有机污染物区域环境过程和健康风险.发表论文1篇.

引用本文:

李宏宇, 李沛祺, 黄娟, 杨兆莉, 刘鹏, 张丽园, 马海波, 毛潇萱, 高宏, 黄韬. 兰州市大气OPAHs污染特征及潜在来源分析[J]. 中国环境科学, 2022, 42(8): 3561-3571. LI Hong-yu, LI Pei-qi, HUANG Juan, YANG Zhao-li, LIU Peng, ZHANG Li-yuan, MA Hai-bo, MAO Xiao-xuan, GAO Hong, HUANG Tao. Pollution characteristics and potential pollution source regions of atmospheric OPAHs in Lanzhou. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(8): 3561-3571.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2022/V42/I8/3561

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