||The Feitsui reservoir supplies the water use for northern Taiwan. Hence, it water quality is closely linked to people’s well being. This study is concerned with the polycyclic aromatic hydrocarbons (PAHs) in the Feitsui reservoir. PAHs are an organic contaminants that have hydrophobic, toxic, carcinogenic, mutagenic and bioaccumulative. PAHs are generated from combustion or high temperature alteration of organic matters. PAHs is cycled through the environment until buried in sediments. The objective of this study is to investigate the composition and concentration of PAHs in settling particles and sediments, to assess the PAHs fluxes in settling particles, and to explore the compositional differebces of PAHs in settling particles and sediments. Finally, we hope to understand the sources of the PAHs.|
The PAHs concentration in settling particles ranges from 1258 to 29112 ng/g. The PAHs concentration in sample from the 20m trap use higer than those in sample from the 70m trap. In general, the PAHs concentrations in settling particles are positively correlated with contents of organic carbon. When environmental PAHs concentration is too high, we cannot detect the correlation between PAHs concentration and organic carbon content. PAHs composition in settling particles were special in March, April, August and September, 2005. In frist two months, the PAHs compostion was dominated by pyrene In the other two months, it was dominated by dimethylnaphthalene.
The range of PAHs concentrations in sediments were between 330∼804ng/g, and showed low correlation with organic carbon contents. The PAHs concentrations in sediments collected from cross-section No.15 had the highest values, the maximum occurred at 6 cm below surface. The principle compound was perylene.
In gernal, the PAHs flux of settling particles was between 4 and 465 mg/m2/day with a trend similar to that of the mass flux of settling particles flux. It was enhanceced by the turbid flow. The PAHs flux in March and September showed pattern different from the mass flux, because the PAHs concentration in settling particles in March and September were especially high.
Based on principle component analysis (PCA), the PAHs composition of settling particles and sediments can be divided into four fypes: the PAHs composition of surface sediments and suspended particles, which represents the background condition in the Feitsui reservoir; Second, the PAHs composition in settling particles in March and April, which was dominated by pyrene and might come directly from atomospheric deposition; Third, the PAHs composition in settling particles in August and September, which might come from the surface soils brought into the reservoir by strong typhoon precipitation; Fourth, the PAHs composition in sediments from cross-section No.15, which very high concentrations of perylene. The last type may have been contributed from a nearly tributary. The PAHs compositions of sediments and settling particles were significant different. The PAHs concentration in sediments were considerably lower than those in settling particles. The difference was attributed to degradation of PAHs in sediments and mineral dilution.
Finally, we used isomer ratio to identify the PAHs sources, we found that the PAHs in sediments may have originated mainly from combustion of organic matters; whereas the PAHs in settling particles may have originated from mainly petroleum.
||Baker, J. E.; Eisenreich, S. J.; Eadie, B. J., 1991. Sediment trap fluxes and benthic recyclic of organic carbon, polycyclic aromatic hydrocarbons, and polychlorobiphenyl congeners in Lake Superior. Environ. Sci. Technol. Vol 25, 500-509.|
Baker, J. E. and Eisenreich, S. J., 1989. PCBs and PAHs as tracers of particulate dynamics in large lakes. J. Great Lakes Res., 15, 84-103
Baker, J. E. and Eisenreich, S. J., 1990. Concentrations and fluxes of polycyclic aromatic hydrocarbons and polychlorinated biphenyl across the air-water interface of Lake Superior, Environ. Sci. Technol.Vol 24, 342-352
Bamford, H. A.; Larsen, R. K.; Ko, F.; Baker, J. E., 1999. Diffusive Exchange of Polycyclic Aromatic Hydrocarbons across the Air-Water Interface of the Patapsco River, an Urbanized Subestuary of the Chesapeake Bay. Environ. Sci. Technol. Vol.33, 2138-2144.
Davis, C. S. ; Fellin P. ; Otson R., 1987. A Review os Sampling Methods for polynuclear Aromatic Hydrocarbons in Air. Journal of Applied Crystallography, Vol. 37, pp. 1397-1408, 1987
Dachs, J.; Eisenreich, S. J.; Baker, J. E.; Ko, F.; Jeremiason, J. D., 1999. Coupling of Phytoplankton Uptake and Air-Water Exchange of Persistent Organic Pollutants. Environ. Sci. Technol. Vol. 33, 3653-3660.
Dickhut, R.M.; Canuel, E.A.; Gustafson, K.E.; Liu, K., Arzayus, K.M.; Walker, S.E.; Edgecombe, G.; Gaylor, M.O.; Macdonald, E.H., 2000. Automotive sources of carcinogenic polycyclic aromatic hydrocarbons associated with particulate matter in the Chesapeake Bay region. Environ. Sci. Technol. 34, 4635-4640.
Elisabeth Lipiatou, Joan Albaigés, 1994. Atmospheric deposition of hydrophobic organic chemicals in the northwestern Mediterranean Sea: comparison with the Rhone river input. Marine Chemistry Vol. 46, 153-164
Grimmer, G., 1983. Environmental Carcinogens: Polycyclic Aromatic Hydrocarbons , CRC Press Inc.
Hartmann, P.C.; Quinn, J.G.; Carins, G.W.; king, J.W., 2004. The distribution and sources of polycyclic aromatic hydrocarbons in Narragansett Bay surface sediments. Mar. Pollut. Bull. 48, 351-358.
Kuklick, J.R.; Sivertsen, S.K.,; Sanders, M.; Scott, G.I., 1997. Factors influencing polycyclic aromatic hydrocarbons distributions in South Carolina estuarine sediments. J. Exp. Mar. Biol. Ecol. 213, 13-29.
Ko, F. C. and Baker, J. E., 2004. Seasonal and annual loads of hydrophobic organic contaminants from the Susquehanna River basin to the Chesapeake Bay. Marine Pollution Bulletin Vol.48, 840-851.
Ko, F. C., Sanford, L. P., Baker, J. E., 2003. Internal recycling of particle reactive organic chemicals in the Chesapeake Bay water column. Marine Chemistry Vol. 81, 163-176
Ko, F. C., Baker J.E., 1995. Partitioning of hydrophobic organic contaminants to resuspended sediments and plankton in the mesohaline Chesapeake Bay. Marine Chemistry Vol. 49, 171-188.
Lee, M.L.; Pardo, G.P.; Howard, J.B.; Hites, R.A., 1977. Source identification of urban airborne polycyclic aromatic hydrocarbons by gas chromatographic mass spectrometry. Biomed. Mass Spectrom. 4, 182-186
Neff, J. M., 1979. Polycyclic aromatic hydrocarbons in the aquatic environment: Sources, fate and biological effects. Applied Science puclisher, London, UK.
Notar, M.; Leskovsek, H.; Faganeli, J., 2001. Composition, distribution and sources of polycyclic aromatic hydrocarbons in sediment of the Gulf of Trieste, Northern Adriatic Sea. Mar. Pollut. Bull. 42, 36-44.
Oros, D.R.; Ross, J.R.m., 2004. Polycyclic aromatic hydrocarbons in San Francisco Estuary sediments. Mar. Chem. 86, 169-184
Peter W. J., 1978. Handbook of carcinogens and other hazardous substances – Chemical and trace analysis : Chapter8 – Polynuclear Aromatic hydrocarbons.
Pott, P., 1775. Chirurgical Observations Relative to the Cataract, the Polypus of the Nose, the Cancer of Scrotum, the Different Kinds of Ruptures, and the Mortification of the Toes and Feet, Hawes, L.; Clarke, W.; Collins, R. London.
Simpson, D. C.; Harrington, C .F. and Cullen. W. R., 1998. Polycyclic aromatic hydrocarbons contamination in marine sediments near Kitimat, British Columbia. Environ. Sci. Technol. Vol. 32, 3266-3272.
Sanders, G.; Hamilton-Taylor, J.; Jones. K. C., 1996. PCB and PAHs dynamics in a small rural lake. Environ. Sci. Technol. Vol. 30, 2958-2966
Sanders, G.; Taylor, J. H.; Jones, K.C., 1996. PCB and PAHs dynamics in a small rural lake. Environ. Sci. Technol. 30, 2958-2966.
Yunker, M.B.; Macdonald, R.W.; Vingarzan, R.; Mitchell, R.H.; Goyette, D.; Sylvestre, S., 2002. PAHs in the Fraser River basin: a critical appraisal of PAHs ratios as indicators of PAHs source and composition. Organic Geochemistry 33, 489-515.
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