期刊
ATMOSPHERIC ENVIRONMENT
卷 43, 期 15, 页码 2489-2496出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2009.01.048
关键词
Mercury; Arsenic; Dust; Geoaccumulation index; Enrichment factor; Contamination assessment
资金
- Program for New Century Excellent Talents in University [NCET-05-0861]
- Provincial Natural Sciences Foundation of Shaanxi Province [20015DI4]
The physicochemical properties and the contamination levels of mercury and arsenic in roadway dust from Baoji, NW China were investigated using an Atomic Fluorescence Spectrophotometer. Contamination levels were assessed based on the geoaccumulation index and the enrichment factor. The results show that magnetic susceptibilities of roadway dust were higher than Holocene loess-soil of central Shaanxi Loess Plateau. The mean contents of organic matter, PM10 and PM100 were 8.8%, 21.8% and 98.6%, respectively. Mercury concentration ranged from 0.48 to 2.32 mu g g(-1), with a mean value of 1.11 mu g g(-1), 17.1 times the Chinese soil mercury background value and 37 times the Shaanxi soil mercury background value. Arsenic concentration ranged from 9.0 to 42.8 mu g g(-1), with a mean value of 19.8 mu g g(-1), 1.8 times the Chinese and Shaanxi soil arsenic background values. The geoaccumlation index and enrichment factor indicate that mercury in the dust mainly originated from anthropogenic sources with ratings of strongly polluted and strongly to extremely polluted, whereas arsenic in dust originated from both natural and anthropogenic sources. with a ratings of moderately to strongly polluted and strongly polluted. Industrial activities, such as a coal-fired power station, coke-oven plant, and cement manufacturing plant, augmented by vehicular traffic, are the anthropogenic sources of mercury and arsenic in the roadway dust. (C) 2009 Elsevier Ltd. All rights reserved.
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