Sources and health risks of heavy metals in kindergarten dust: The role of particle size

作者：Peng Wang, Jian Hu, Qian Zhang, Wenmin Ma, Liyan Tian, Tingyi Liu, Jun Li, Houyi Zheng, Guilin Han · 发表于：Environmental Research · 年份：2024 · DOI：10.1016/j.envres.2024.119955 · 被引用次数：8 · 研究领域：Air Quality and Health Impacts、Radioactivity and Radon Measurements、Heavy metals in environment

Particle size effects significantly impact the concentration and toxicity of heavy metals (HMs) in dust. Nevertheless, the differences in concentrations, sources, and risks of HMs in dust with different particle sizes are unclear. Therefore, guided by the definition of atmospheric particulate matter , dust samples with particle sizes under 1000 μm (DT 1000 ), 100 μm (DT 100 ), and 63 μm (DT 63 ) from Beijing kindergartens were collected. The concentrations of HMs (e.g., Cd, Pb, Zn, Ni, Cr, Ba, Cu, V, Mn, Co, and Ti) in dust samples with different particle sizes were measured. Besides, the differences in HM concentrations , contamination levels, sources, and source-oriented health risks in dust samples of different particle sizes were systematically explored. The results show that the concentrations of Mn, V, Zn, and Cd gradually increase with decreasing dust particle sizes, the concentrations of Ba and Pb show a decreasing trend, and the concentrations of Cr, Cu, Ni, and Co display an increasing and then decreasing trend. The degree of contamination of HMs in dust of different particle sizes varies, with Cd being the most dominant contaminant. Compared with DT 1000 and DT 63 , DT 100 is the most polluted. In addition, the sources of HMs in DT 1000 , DT 100 , and DT 63 become more single with decreasing particle size, which may be mainly due to the particle-size effect inducing the redistribution of HMs in different sources. Notably, the potential health risk is higher in DT 1...