期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 407, 期 22, 页码 5855-5860出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2009.07.018
关键词
Metals; Source apportionment; Source characterization; Principal components analysis; Cadmium; Brake rotors
资金
- California Department of Transportation [43A0168]
- National Institute of Environmental Health Sciences (NIEHS)
- NIH [5 P42 ES004699]
Properly apportioning the loads of metals in highway stormwater runoff to the appropriate sources requires accurate data on source composition, especially regarding constituents that help to distinguish among sources. Representative tire and brake samples were collected from privately owned vehicles and aqueous extracts were analyzed for twenty-eight elements. Correlation principal components analysis (PCA) revealed that tires were most influenced by Zn, Pb. and Cu. while brakes were best characterized by Na and Fe followed by Ba,Cu, Mg, Mn, and K; the latter three maybe due to roadside soil contributions. Notably elevated Cd contributions were found in several brake samples. A targeted Cd-plated brake rotor was sampled, producing results consistent with the elevated levels found in the larger sample population. This enriched source of Cd is of particular concern due to high toxicity of Cd in aquatic ecosystems. (C) 2009 Elsevier B.V. All rights reserved.
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