Indoor dust is an enriched environmental media for lots of chemical pollutants, while indoor pollutants pose high exposure level and health risks to humans. In this work, indoor dust samples from four types of indoor environments (residence near steel plant, residence near road, student dormitory and rural kitchen) in Nanchang city were collected and their particle sizes and carbon components were analyzed. The sources of carbon components were traced based on the distribution of carbon components and the correlation between the components. The particle size distribution mainly presents a bimodal mode (0.1–3 and 10–40 μm size intervals, accounting for 8.9% and 7.4%). The average OC and EC in the as-collected indoor dust samples were 34.1 and 52.7 mg/g for residences around the steel plant, 43.9 and 41.4 mg/g for residences adjacent to the road, 119.3 and 66.4 mg/g for students' dormitories, 73.5 and 49.8 mg/g for rural kitchens, respectively. A strong correlation between OC and Char was observed, indicating strong homology between the sources of the two components. In addition, the correlation between two of EC, OC, and OC (OC and OC are fractions of OC and EC is a fraction of EC) were significant, indicating a large contribution of motor vehicle exhaust to indoor dust. The average ratios of OC/EC and Char/Soot suggest the contribution of automobile exhaust, indoor smoking and biomass combustion to indoor dust. The results of this work provide a scientific, convenient, and reliable approach to explore the source of particulate matter indoors based on the distribution of carbon components.

中文翻译：

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南昌市室内粉尘粒径、碳成分及来源

室内灰尘是多种化学污染物的富集环境介质，室内污染物对人体造成高暴露水平和健康风险。本研究采集了南昌市四类室内环境（钢厂附近住宅、路边住宅、学生宿舍和农村厨房）的室内灰尘样品，并对其粒径和碳成分进行了分析。根据碳组分的分布情况以及组分之间的相关性，追踪碳组分的来源。粒径分布主要呈现双峰模式（0.1~3μm和10~40μm粒径区间，分别占8.9%和7.4%）。所采集的室内灰尘样品中，钢厂周围住宅的平均OC和EC分别为34.1和52.7毫克/克，毗邻道路的住宅为43.9和41.4毫克/克，学生宿舍为119.3和66.4毫克/克。农村厨房分别为 73.5 和 49.8 毫克/克。观察到 OC 和 Char 之间存在很强的相关性，表明这两个成分的来源之间具有很强的同源性。此外，EC、OC、OC（OC、OC为OC的分数，EC为EC的分数）两者之间相关性显着，表明机动车尾气对室内扬尘的贡献较大。 OC/EC 和 Char/Soot 的平均比值表明汽车尾气、室内吸烟和生物质燃烧对室内灰尘的贡献。该工作结果为基于碳成分分布探究室内颗粒物来源提供了科学、便捷、可靠的方法。