title: [Pollution characteristics of platinum group elements in road dust in central urban area of Beijing].
abstract: In order to survey platinum group elements (PGEs) contamination in central urban area of Beijing, dust samples were collected from the second ring road in December 2009. The road samples were digested with aqua regia and separated and purified with cation exchange resin, and the resulting solutions were analyzed by inductively coupled plasma mass spectrometry (ICP-MS). The results showed that the concentrations of Pd, Pt and Rh in road dust ranged from 17.40-458.75 ng x g(-1) (126.66 ng x g(-1)), 10.04-182.89 ng x g(-1) (65.25 ng x g(-1)), 4.00-68.04 ng x g(-1) (22.67 ng x g(-1)) respectively. In comparison with international cities, Pd and Rh concentrations in Beijing road dust were middle level and Pt concentration was lower. Pd concentration was rapidly increased in recent years. The concentrations of PGEs in four locations of the second ring road were arranged in the following order: West approximately East > North > South, which were controlled with the traffic intensity. Size partitioning indicated that the 0.125-0.25 mm fraction had the higher PGEs concentrations than other fractions and the < 0.063 mm fraction had the lower PGEs concentration. These data suggest that autocatalyst PGEs flux estimates into the environment will be significantly underestimated if only a fine grain size fraction (< 0.063 mm) is analyzed.
authors.affiliation: Department of Water Environment, China Institute of Water Resources and Hydropower Research, Beijing 100038, China. xulingling1108@163.com
authors.forename: Ling-Ling
authors.initials: LL
authors.lastname: Xu
authors.forename: Bo
authors.initials: B
authors.lastname: Gao
authors.forename: Jin
authors.initials: J
authors.lastname: Lu
authors.forename: Huai-Dong
authors.initials: HD
authors.lastname: Zhou
authors.forename: Hong
authors.initials: H
authors.lastname: Hao
authors.forename: Xiao-Jun
authors.initials: XJ
authors.lastname: Wang
mesh_terms: D002681:China; D002947:Cities; D004391:Dust / Q000032:analysis*; D004784:Environmental Monitoring; D004785:Environmental Pollutants / Q000032:analysis*; D010984:Platinum / Q000032:analysis*; D001335:Vehicle Emissions / Q000032:analysis*
chemical_list: D004391:Dust; D004785:Environmental Pollutants; D001335:Vehicle Emissions; D010984:Platinum