期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 389, 期 2-3, 页码 367-377出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2007.08.045
关键词
polycyclic aromatic hydrocarbons; stable carbon isotope ratios; compound specific isotope analysis; source; sediment
资金
- National Research Foundation of Korea [2006-351-C00051] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Molecular compositions and compound specific stable carbon isotope ratios of polycyclic aromatic hydrocarbons (PAH) isolated from sediments were used to characterize possible sources of contamination at an urban lake, a harbor, a shipping waterway, and a relatively undisturbed remote lake in the northwest United States. Total PAH concentrations in urban lake sediments ranged from 66.0 to 16,500 mu g g(-1) dry wt. with an average of 2600 mu g g(-1), which is similar to 50, 100, and 400 times higher on average than PAH in harbor (48 mu g g(-1) on average), shipping waterway (26 mu g g(-1)), and remote lake (7 mu g g(-1)) sediments, respectively. The PAH distribution patterns, methyl phenanthrene/phenanthrene ratios, and a pyrogenic index at the sites suggest a pyrogenic origin for PAHs. Source characterization using principal component analysis and various molecular indices including C2-dibenzothiophenes/C2-phenanthrenes, C3dibenzothiophenes/C3-phenanthrenes, and C2-chrysenes/C2-phenanthrenes ratios, was able to differentiate PAH deposited in sediments from the four sites. The uniqueness of the source of the sediment PAHs from urban lake was also illustrated by compound specific stable carbon isotope analysis. It was concluded that urban lake sediments are accumulating PAH from sources that are unique from contamination detected at nearby sites in the same watershed. (c) 2007 Elsevier B.V. All rights reserved.
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