Fingerprinting Elemental Composition of Street Sediments and Aerosol at Beijing
Urban street sediments are important sinks which consists of highly diverse deposition of suspended particles from direct emission from several anthropogenic origins and from soil. Street sediments remain deposited in a certain place for a short time and are easily re-suspended back into atmospheric aerosol by wind or the movement of vehicles, and are often helpful to identify relevant sources of air pollution. Therefore, sustainable urban environmental development has to be based on comprehensive knowledge on the land use-related chemical composition of urban street sediments and its influence on air quality. Different land uses specifically affect the chemical composition of urban street sediments, which causing various negative impacts on atmospheric pollution. However, till today, knowledge on Beijings street sediments and air pollution is more often linked to the environmental assessments respectively; comprehensive comparison on their composition and origin is generally limited. Therefore, in autumn 2005 before heating season, a street sediments and aerosol survey was carried out to investigate land use-related influences on street sediments and aerosol formation at Beijing. Sixteen locations were chosen for detailed investigations of distributions and concentrations of various chemical elements in street sediments. These 16 locations represent anthropogenic impacts of different land uses and comprise one High-Tech Park (industrial) site, two sites of 5th Ring Road, two sites of 4th Ring Road, two sites of 3rd Ring Road, two sites of 2nd Ring Road, three sites of the city center, one site at a big bus stop hub, one site from construction site and two site from residential area. Street sediments samples were analysed for their chemical compositions by AFS (As, Sb), X-ray fluorescence analysis (Cr, Mn, Pb, Ti, Zn, Al, Fe, Ca, K) and ICP-MS (inductively coupled plasma mass spectrometer) (Cd, Cu, Ni). One location was chosen for chemical properties analysis of PM2.5 (suspended particulate matter with aerodynamic diameter less than 2.5 μm). This sampling site was set up to represent a typical area in an important transaction cross, which could better reflect the interactional influence between street sediments and aerosol. Twenty three airborne PM2.5 particulate matters were collected weekly in autumn 2005 before heating season (from September 1st to November 15th). This study demonstrated that characteristics of fingerprinting elements not only in the air but also in the street sediments in the Beijing area over a certain autumn period without influences of dust storms and domestic heating. The statistical evaluation of the data by chemical analysis demonstrates the typical urban environmental pollution elements had relatively higher concentrations in fine particles (PM2.5) than the street sediments. These fine particles deeply can be inhaled into the lung and consequently human beings health is more endangered.
YU Yang CEN Kuang NORRA Stefan LIU Chunhua
Institute of Geochemistry, China University of Geosciences, Beijing 100083, China Institute of Miner Institute of Geochemistry, China University of Geosciences, Beijing 100083, China Institute of Mineralogy and Geochemistry, Karlsruhe Institute of Technology (KIT), Germany Institute
国际会议
2011 International Symposium on Environmental Science and Technology(2011 环境科学与技术国际会议 2011 ISEST)
广东东莞
英文
439-445
2011-06-01（万方平台首次上网日期，不代表论文的发表时间）