First data on trace metal level and behaviour in two major Arctic river-estuarine systems (Ob and Yenisey) and in the adjacent Kara Sea, Russia

Dissolved and colloidal trace element concentrations (Cd, Cu, Fe, Ni and Pb) were determined in the Ob and Yenisey river-estuary systems and in the adjacent Kara Sea in September 1993. The data show a natural low concentration level of ‘dissolved’ (< 0.4 μm) trace metals (Cd, Cu, Fe, Ni and Pb) in the two rivers and in the Kara Sea as compared to world unpolluted rivers and the central Arctic Ocean, suggesting that the region studied is pristine with respect to trace metals. The pathway of trace metals transported from rivers to the ocean seems to be complicated, and largely influenced by biogeochemical processes taking place in the estuarine mixing zone. Colloidal material (104 Daltons-0.4 μm), in addition to its significant contribution to the so-called ‘dissolved’ fraction, has been shown to play a fundamental role in determining the behaviour of both conservative and non-conservative trace metals during estuarine mixing. Hence, colloids may control to a large extent the fate of ‘dissolved’ trace metals as well as their net input from the rivers to the Kara Sea.

[1]  M. Wells,et al.  Marine submicron particles , 1992 .

[2]  P. Micklin.  A preliminary systems analysis of impacts of proposed Soviet River diversions on Arctic sea ice , 1981 .

[3]  M. Wells,et al.  Occurrence of small colloids in sea water , 1991, Nature.

[4]  Y. Herman.  The Arctic Seas: Climatology, Oceanography, Geology, and Biology , 1989 .

[5]  B. Whitehouse,et al.  Cross‐flow filtration of colloids from aquatic environments , 1990 .

[6]  S. Kempe,et al.  Biogeochemistry of major World rivers , 1990 .

[7]  R. Moore.  Oceanographic distributions of zinc, cadmium, copper and aluminium in waters of the central arctic☆ , 1981 .

[8]  K. Rahn.  Atmospheric, riverine and oceanic sources of seven trace constituents to the arctic ocean , 1981 .

[9]  Edward A. Boyle,et al.  Variability of dissolved trace metals in the mississippi river , 1987 .

[10]  E. Boyle,et al.  The chemical mass balance of the amazon plume—II. Copper, nickel, and cadmium , 1982 .

[11]  S. B. Moran,et al.  Short residence time of colloids in the upper ocean estimated from 238U–234Th disequilibria , 1992, Nature.

[12]  P. Santschi,et al.  Coupling adsorption and particle aggregation: laboratory studies of "colloidal pumping" using iron-59-labeled hematite , 1991 .

[13]  P. Yeats,et al.  Trace metal distributions at an Arctic Ocean ice island , 1991 .

[14]  J. Martin,et al.  Significance of colloids in the biogeochemical cycling of organic carbon and trace metals in the Venice Lagoon (Italy) , 1995 .

[15]  F. Elbaz-Poulichet,et al.  Preliminary assessment of the distributions of some trace elements (As, Cd, Cu, Fe, Ni, Pb and Zn) in a pristine aquatic environment: The Lena River estuary (Russia) , 1993 .

[16]  L. E. Fox,et al.  The solubility of colloidal ferric hydroxide and its relevance to iron concentrations in river water , 1988 .

[17]  D. Dyrssen,et al.  Trace metal levels in the Eastern Arctic Ocean , 1984 .

[18]  M. Yamazaki,et al.  Physicochemical Speciation of Trace Elements in River Water by Means of Ultrafiltration , 1985 .

[19]  R Wagemann,et al.  Arctic marine ecosystem contamination. , 1992, The Science of the total environment.

[20]  G. Benoit,et al.  Scavenging of thorium isotopes by colloids in seawater of the Gulf of Mexico , 1992 .

[21]  J. Edmond,et al.  Chemical dynamics of the Changjiang estuary , 1985 .

[22]  D. Dyrssen,et al.  Low Level Determination of Trace Metals in Arctic Sea Water and Snow by Differential Pulse Anodic Stripping Voltammetry , 1983 .

[23]  P. Hatcher,et al.  Bulk Chemical Characteristics of Dissolved Organic Matter in the Ocean , 1992, Science.

[24]  M. Wells,et al.  The distribution of colloids in the North Atlantic and Southern Oceans , 1994 .

[25]  R. Létolle,et al.  18O abundance and dissolved silicate in the Lena delta and Laptev Sea (Russia) , 1993 .

[26]  F. Elbaz-Poulichet,et al.  Dissolved Cd behaviour in some selected french and chinese estuaries. Consequences on Cd supply to the ocean , 1987 .

[27]  Leif G. Anderson,et al.  An assessment of the transport of atmospheric CO2 into the Arctic Ocean , 1990 .

[28]  L. Anderson,et al.  Nutrient regeneration in cold, high salinity bottom water of the Arctic shelves , 1988 .

[29]  J. D. Burton,et al.  Trace Metals in Sea Water , 1983 .

[30]  M. Baskaran,et al.  The role of particles and colloids in the transport of radionuclides in coastal environments of Texas , 1993 .

[31]  L. Danielsson,et al.  Trace Metals in the Arctic Ocean , 1983 .

[32]  L. Danielsson,et al.  Trace metal determinations in estuarine waters by electrothermal atomic absorption spectrometry after extraction of dithiocarbamate complexes into freon , 1982 .

[33]  R. Baker,et al.  Organic substances and sediments in water , 1900 .

[34]  H. Windom,et al.  Trace metal-nutrient relationships in estuaries , 1991 .

[35]  J. M. Martin,et al.  A reassessment of the Eurasian river input of water, sediment, major elements, and nutrients to the Arctic Ocean , 1996 .

[36]  M. Yamazaki,et al.  Physico-chemical speciation of trace elements in urban streams by size fractionation , 1992 .

[37]  Y. Tanizaki,et al.  Physicochemical speciation of trace elements in river waters by size fractionation , 1992 .

[38]  P. Yeats.  Manganese, nickel, zinc and cadmium distributions at the fram-3 and cesar ice camps in the arctic ocean , 1988 .

[39]  J. Walsh.  Arctic carbon sinks: Present and future , 1989 .

[40]  J. J. Morgan,et al.  Natural levels of lead and cadmium in a remote mountain stream , 1991 .

[41]  E. A. Romankevich.  Geochemistry of organic matter in the ocean , 1984 .

[42]  G. Cauwet,et al.  The biogeochemistry of Lena River: organic carbon and nutrients distribution , 1996 .