重庆典型城区PM2.5中含硫有机物的分子特征与成因

赵鑫泉; 宋洋; 梁波; 唐浩辉; 王森华; 陈静; 田密

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (6) : 2961-2973.

大气污染与控制

重庆典型城区PM_2.5中含硫有机物的分子特征与成因

赵鑫泉¹, 宋洋², 梁波², 唐浩辉¹, 王森华¹, 陈静¹, 田密¹

作者信息 +

Molecular characteristics and impact factors of PM_2.5-bound sulfur-containing organics in downtown Chongqing

ZHAO Xin-quan¹, SONG Yang², LIANG Bo², TANG Hao-hui¹, WANG Sen-hua¹, CHEN Jing¹, TIAN Mi¹

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文章历史 +

摘要

使用电喷雾电离结合离子迁移谱-飞行时间质谱仪(ESI-IMS-TOF-MS)分析了重庆典型城区冬季PM_2.5样品中有机物的分子组成.结果发现,含硫有机物(CHOS+CHNOS)是有机气溶胶中的重要成分,其平均相对丰度超过70%.IMS衍生的碰撞截面、碰撞诱导解离和肯德里克质量缺陷分析证明了有机硫酸酯(OSs)的存在.分子特征分析表明含硫有机物以碳水化合物和木质素为主,且相较于其他地区,具有较高的氧化程度.生物源和人为源前体物是其重要来源.气溶胶液态水含量、酸度和无机硫酸盐与含硫有机物的关系表明了水相化学和酸催化化学在含硫有机物的形成中起着重要的作用.

Abstract

The molecular compositions of organic components in winter PM_2.5 samples from a typical urban area of Chongqing were analyzed by electrospray ionization coupled with ion mobility spectrometry-time of flight mass spectrometry (ESI-IMS-TOF-MS). Sulfur-containing organics (CHOS+CHNOS) were important components in organic aerosol, and their relative abundance accounted for more than 70% on average. IMS-derived collision cross section, collision-induced dissociation, and Kendrick mass defect analyses verified the presence of organosulfates (OSs). Molecular characterization results indicated that sulfur-containing organics were dominated by carbohydrate and lignin species and had higher oxidation degree in Chongqing urban area compared with other cities. Biogenic and anthropogenic precursors were important sources of sulfur-containing organics. The relationships between aerosol liquid water content, acidity and inorganic sulfate with sulfur-containing organics suggested that aqueous-phase chemistry and acid-catalyzed chemistry play important roles in the formation of sulfur-containing organics.

导出引用

赵鑫泉, 宋洋, 梁波, 唐浩辉, 王森华, 陈静, 田密. 重庆典型城区PM_2.5中含硫有机物的分子特征与成因[J]. 中国环境科学. 2025, 45(6): 2961-2973

ZHAO Xin-quan, SONG Yang, LIANG Bo, TANG Hao-hui, WANG Sen-hua, CHEN Jing, TIAN Mi. Molecular characteristics and impact factors of PM_2.5-bound sulfur-containing organics in downtown Chongqing[J]. China Environmental Science. 2025, 45(6): 2961-2973

中图分类号： X513

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