Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, School of Chemistry and Materials Science, Shaanxi Normal University, Xi'an, 710062, PR China.
Environ Pollut. 2011 Feb;159(2):577-84. doi: 10.1016/j.envpol.2010.10.006. Epub 2010 Nov 16.
Physical characterization and chemical analysis of settled dusts collected in Xi'an from November 2007 to December 2008 show that (1) dust deposition rates ranged from 14.6 to 350.4 g m(-2) yr(-1). The average deposition rate (76.7 g m(-2) yr(-1)) ranks the 11th out of 56 dust deposition rates observed throughout the world. The coal-burning power was the major particle source; (2) on average (except site 4), ∼10% of the settled dusts having size <2.6, ∼30% having size <10.5, and >70% having size <30 μm; (3) the concentrations for 20 out of 27 elements analyzed were upto 18 times higher than their soil background values in China. With such high deposition rates of dusts that contain elevated levels of toxic elements, actions should be taken to reduce emission and studies are needed to assess the potential impacts of settled particles on surface ecosystem, water resource, and human health in the area.
对 2007 年 11 月至 2008 年 12 月期间在西安采集的沉降粉尘进行物理特性分析和化学分析表明：(1) 降尘速率范围为 14.6-350.4g·m(-2)·yr(-1)。平均降尘速率(76.7g·m(-2)·yr(-1))在全世界 56 个降尘速率观测点中排名第 11。燃煤电厂是主要的尘源；(2) 除站点 4 外，平均而言，粒径<2.6μm 的沉降粉尘约占 10%，粒径<10.5μm 的沉降粉尘约占 30%，粒径>30μm 的沉降粉尘约占 70%；(3) 在所分析的 27 种元素中，有 20 种元素的浓度高达其在中国土壤背景值的 18 倍。鉴于如此高的粉尘降尘速率以及其中含有高浓度的有毒元素，应该采取行动来减少排放，并对沉降颗粒对该地区地表生态系统、水资源和人类健康的潜在影响进行评估。
