Chemical characteristics and pollution sources of petroleum hydrocarbons and PAHs in sediments from the Beiluohe River,Northern China |
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Authors: | Li Zhang Kelin Shi Leping Yue |
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Institution: | (1) Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou, China;(2) Department of Geology, Northwest University, 710069 Xi’an, China |
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Abstract: | To determine the degree of hydrocarbon contamination and the contribution of local petroleum industries to contaminant loadings
in sediments from the Beiluohe River, China, 12 surface sediment samples were collected for geochemical analysis in 2005.
Sediment samples were extracted by organic solvents, separated by silica gel column chromatography and the profiles of n-alkanes, biomarkers and polycyclic aromatic hydrocarbons (PAHs) in sediments were analyzed by gas chromatography with flame
ionization detector and gas chromatography/mass spectroscopy. Concentrations of total hydrocarbons in the sediments varied
from 12.1 to 3,761.5 μg g−1 dry wt, indicating that most sediments in Beiluohe River was only slightly to moderately contaminated by hydrocarbons. Concentrations
of PAHs for six samples (sum of 16 isomers) varied from 17.7 to 407.7 ng g−1 dry wt and at present low levels of PAHs did not cause adverse biological effects in Beiluohe River sedimentary environment.
PAH compositions, n-alkanes and biomarker profiles all suggested that there were different sources of contaminations in studied areas. n-Alkanes reflect two distinct sources: a fossil n-alkane series from crude oil at sites S40, S43, S87 and plantwax n-alkanes at sites S39 and S45. Judged by their PAH ratios, the sediments at site S15 were pyrolytic, sediments at S17 and
S43 were petrogenic, and sediments at S39, S40 and S64 had a mixture source of pyrolytic and petrogenic. |
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Keywords: | Beiluohe River Sediments Contamination Aliphatic hydrocarbons PAHs |
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