State Key Laboratory of Organic Geochemistry and Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China; University of Chinese Academy of Sciences, Beijing 100049, China.
State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, China.
Sci Total Environ. 2021 Jul 15;778:146248. doi: 10.1016/j.scitotenv.2021.146248. Epub 2021 Mar 10.
Density (ρ) is one of the most important physical properties of aerosol particles. Owing to the complex nature of aerosols and the challenges of measuring them, effective density (ρ) is generally used as an alternative measure. Various methods have been developed to quantify the ρ of aerosols, which provide powerful technical support and understanding of their physical properties. Here, we present a comprehensive review of the characterisation techniques of ρ currently used in the literature. Overall, six categories of measurement are identified, and the typical configuration, measurement principles, errors and field applications of each are demonstrated. Their respective advantages and disadvantages are also discussed to improve their application. Finally, we outline future directions for further technical improvement in, and instrumental development for, ρ measurement.
密度（ρ）是气溶胶粒子最重要的物理性质之一。由于气溶胶的复杂性和测量的挑战性，有效密度（ρ）通常被用作替代测量方法。已经开发了各种方法来量化气溶胶的 ρ，这些方法为理解其物理性质提供了有力的技术支持。在这里，我们对文献中目前使用的 ρ 特性描述技术进行了全面的回顾。总体而言，确定了六个测量类别，并展示了每个类别的典型配置、测量原理、误差和现场应用。还讨论了它们各自的优缺点，以改进它们的应用。最后，我们概述了 ρ 测量在技术改进和仪器开发方面的未来发展方向。
