Abstract
Analytical methods of dissolved Se species in river water and seawater were established and applied to study dissolved Se speciation in the Kaoping and Erhjen rivers and estuaries, southwestern Taiwan. The Kaoping and Erhjen rivers and estuaries were respectively in relatively oxygenated and oxygen-deficient conditions as revealed from the distributions of dissolved oxygen, DOC, nutrients, and dissolved Mn. Concentrations of dissolved total Se increased downstream in the riverine sections, ranging from 0.6 nM to 1.2 nM for the Kaoping River and from 0.8 nM to 1.05 nM for the Erhjen River. The dissolved total Se was only slightly higher in the Erhjen middle estuary than in the Kaoping middle estuary in spite of heavier pollution in the former. The dissolved total Se behaved rather conservatively in the Kaoping estuary but nonconservatively in the Erhjen estuary resulting from anthropogenic inputs, and in this respect showed similarities with the behavior of redox-sensitive Mn. The predominant species of selenium were Se(VI) and organic Se in the Kaoping River and Se(VI) in the Kaoping estuary. The elevated concentration of Se(VI) in the Kaoping estuary may stem from the degradation of organic Se and oxidation of Se(IV). On the other hand, Se(IV) and organic Se were equally dominant in the Erhjen River, and Se(IV) was predominant through most of the Erhjen estuary. The elevated distribution of Se(IV) in the Erhjen middle estuary may result mostly from partial decomposition of organic Se, but further oxidation of Se(IV) was inhibited in reducing waters. However, Se(VI) became dominant at Erhjen outer estuary where water was oxygenated by the replacement of intruded coastal seawater. Apparently, the speciation of dissolved Se was mainly controlled by the biological and redox processes in the Kaoping and Erhjen rivers and estuaries.
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Literature Cited
Apte, S. C., andA. G. Howard. 1986. Arsenic, antimony and selenium speciation during a spring phytoplankton bloom in a closed experimental ecosystem.Marine Chemistry 20:119–130.
Church, T. M. 1986. Biogeochemical factors influencing the residence time of microconstituents in a large tidal estuary, Delaware Bay.Marine Chemistry 18:393–406.
Cutter, G. A. 1982. Selenium in reducing waters.Science 217: 829–831.
Cutter, G. A. 1989. The estuarine behavior of selenium in San Francisco Bay.Estuarine, Coastal and Shelf Science 28:13–34.
Cutter, G. A. 1991. Trace elements in estuarine and coastal waters—U.S. studies from 1986–1990.Reviews of Geophysics Supplement: 639–644.
Cutter, G. A., andK. W. Bruland. 1984. The marine biogeochemistry of selenium: A re-evaluation.Limnology and Oceanography 29:1179–1192.
Hung, J. J., andW. A. Chang. 1992. Measurement of dissolved organic carbon in seawater: A comparison between the high-temperature catalytic oxidation method and the persulfate method.Terrestrial, Atmospheric and Oceanic Sciences 3:165–181.
Hung, J. J., andC. C. Huang. 1990. Geochemical distribution and transport of trace metals in the Kaoping riverine and estuarine waters.Proceedings of National Science Council (Republic of China), Part A 14:410–421.
Hung, T. C., P. J. Meng, andC. C. H. Tsai. 1987. Distribution of copper in the Taiwan mariculture area.Journal of Chinese Environmental Protection Society 10:13–34.
Hung, T. C., andC. C. H. Tsai. 1992. Relationships between copper species and forms, hydrographic and biomass parameters in the Taiwan Erhjen Chi coastal area.Chemistry and Ecology 6:1–17.
Kual, L. W., andP. N. Froelich. 1984. Modeling estuarine nutrient geochemistry in a simple system.Geochimica et Cosmochimica Acta 48:1417–1433.
Liss, P. S. 1976. Conservative and nonconservative behaviour of dissolved constituents during estuarine mixing, p. 93–130.In J. D. Burton and P. S. Liss (eds.), Estuarine Chemistry. Academic Press London.
Masscheleyn, P. R., R. D. Delaune, andW. H. Patrick, Jr. 1990. Transformations of selenium as affected by sediment oxidation-reduction potential and pH.Environmental Science and Technology 24:91–96.
Measures, C. I., andJ. D. Burton. 1978. Behavior and speciation of dissolved selenium in estuarine waters.Nature 273:293–295.
Measures, C. I., andJ. D. Burton. 1980. Gas chromatographic method for the determination of selenite and total selenium in sea water.Analytica Chimica Acta 120:177–186.
Price, N. M., P. A. Thompson, andP. J. Harrison. 1987. Selenium: An essential element for growth of the coastal marine diatomThalassiosira pseudomana.Journal of Phycology 23:1–9.
Robberecht, H., andR. Van Grieken. 1982. Selenium in environmental waters: Determination, speciation and concentration levels.Talanta 29:823–844.
Sholkovitz, E. R., andD. Copland. 1981. The coagulation, solubility and absorption properties of Fe, Mn, Cu, Ni, Cd, Co and humic acids in a river water.Geochimica et Cosmochimica Acta 45:181–189.
Shy, C. P. 1991. Determination of Se and Mn in river and sea waters from Taiwan and their significance. M.S. Thesis, National Sun Yat-Sen University, Taiwan, Republic of China.
Strickland, J. D. H., andT. R. Parsons. 1972. A Practical Handbook of Seawater Analysis. Bulletin 167 (2nd ed.), Fisheries Research Board of Canada, Ottawa, Canada.
Sturgeon, R. E., S. N. Willie, andS. S. Berman. 1985. Preconcentration of selenium and antimony from seawater for determination by graphite furnace atomic absorption spectrometry.Analytical Chemistry 57:6–9.
Sugimura, Y., Y. Suzuki, andY. Miyake. 1978. Chemical forms of minor metallic elements in the ocean.Journal of the Oceanographical Society of Japan 34:93–96.
Takayanagi, K., andD. Cossa. 1985. Speciation of dissolved selenium in the upper St. Lawrence estuary, p. 275–284.In A. C. Sigleo and A. A. Hattori (eds.), Marine and Estuarine Geochemistry, Lewis Publishers, Inc., Michigan.
Takayanagi, K., andG. F. T. Wong. 1984. Total selenium and selenium (IV) in the James River estuary and southern Chesapeake Bay.Estuarine, Coastal and Shelf Science 18:113–119.
Takayanagi, K., andG. F. T. Wong. 1985. Dissolved inorganic and organic selenium in the Orca Basin.Geochimica et Cosmochimica Acta 49:539–546.
Water Resources Planning Commission. 1990. Hydrological Year Book of Taiwan. Water Resources Planning Commission, Republic of China.
Wei, C. K. 1983 Investigation of pollutant sources and reclamation proposal for the Erhjen River. Report of the Institute of Environmental Engineering, National Cheng-Kung University, Taiwan. Republic of China.
Wrench, J. J. 1978. Selenium metabolism in the marine phytoplankersTetraselmis tetrathele andDunaliella mimuta.Marine Biology 49:231–236.
Wrench, J. J., andC. I. Measures. 1982. Temporal variations in dissolved selenium in a coastal ecosystem.Nature 299:431–433.
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Hung, J.J., Shy, C.P. Speciation of dissolved selenium in the Kaoping and Erhjen rivers and estuaries, southwestern Taiwan. Estuaries 18, 234–240 (1995). https://doi.org/10.2307/1352633
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DOI: https://doi.org/10.2307/1352633