Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
Environ Pollut. 2011 May;159(5):1317-26. doi: 10.1016/j.envpol.2011.01.013. Epub 2011 Feb 5.
The concentration and loading distribution of trace metals (Cu, Zn, Pb, Co, Ni, Cr, and Mn) and major elements (Al, Ca, Fe, and Mg) in different particle size fractions (2000-280, 280-100, 100-50, 50-10, 10-2, and <2 μm) of surface soils from highly urbanized areas in Hong Kong were studied. The enrichment of Pb, Cu, and Zn in the urban soils was strongly influenced by anthropogenic activities, and Pb accumulated in fine particles was mainly derived from past vehicular emissions as shown by Pb isotopic signatures. Trace metals primarily accumulated in clay, fine silt, and very fine sand fractions, and might pose potential health risks via the inhalation of resuspended soil particles in the air (PM10 or PM2.5), and ingestion of adhered soils through the hand-to-mouth pathway. The mobility, bioavailability, and human bioaccessibility of Pb and Zn in bulk soils correlated significantly with metal concentrations in fine silt and/or very fine sand fractions.
本研究测定了香港高度城市化地区表层土壤中不同粒径(2000-280μm、280-100μm、100-50μm、50-10μm、10-2μm 和 <2μm)中痕量金属(Cu、Zn、Pb、Co、Ni、Cr 和 Mn)和常量元素(Al、Ca、Fe 和 Mg)的浓度和赋存分布。研究表明,人为活动强烈影响了城市土壤中 Pb、Cu 和 Zn 的富集,Pb 同位素特征表明,细颗粒中积累的 Pb 主要来自过去的机动车排放。痕量金属主要累积在粘粒、细粉砂和极细砂中,通过吸入空气中的再悬浮土壤颗粒(PM10 或 PM2.5)和通过经手-口途径摄入黏附的土壤,可能会对健康造成潜在风险。土壤中 Pb 和 Zn 的迁移性、生物可利用性和人体可摄入量与细粉砂和/或极细砂中的金属浓度显著相关。