Geochemistry of selenium in a coastal salt marsh

Journal Article · Tue Jan 01 00:00:00 EST 1991 · Geochimica et Cosmochimica Acta; (USA)

DOI:https://doi.org/10.1016/0016-7037(91)90410-7· OSTI ID:5949760

Velinsky, D J; Cutter, G A ^[1]

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1. Old Dominion Univ., Norfolk, VA (USA)

The cycling of sedimentary selenium was examined over a one-year period in the Great Marsh, Delaware (USA). While total selenium and elemental selenium decrease with depth in the sediments at similar rates, Se(IV + VI) exhibits pronounced seasonality related to the redox conditions of the marsh. Porewater selenium reflects the diagenetic cycling of Se(IV + VI) in the sediments and suggests that a partial remobilization of sedimentary selenium occurs when the upper sediments become oxidizing. Diagenetic and mass-balance models indicate that the major sources of selenium to the marsh are creek waters and atmospheric deposition, while total selenium may be removed from the sediments via the flux of volatile selenium compounds.

• OSTI ID: 5949760
• Journal Information: Geochimica et Cosmochimica Acta; (USA), Vol. 55:1; ISSN 0016-7037
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
INTERSTITIAL WATER
GEOCHEMISTRY
SELENIUM
MARSHES
SEDIMENT-WATER INTERFACES
MINERAL CYCLING
CHEMICAL COMPOSITION
DELAWARE
DIAGENESIS
GEOLOGIC MODELS
REDOX REACTIONS
SEASONAL VARIATIONS
SEDIMENTS
THERMODYNAMIC MODEL
AQUATIC ECOSYSTEMS
CHEMICAL REACTIONS
CHEMISTRY
ECOSYSTEMS
ELEMENTS
FEDERAL REGION III
GROUND WATER
HYDROGEN COMPOUNDS
INTERFACES
MATHEMATICAL MODELS
NORTH AMERICA
OXYGEN COMPOUNDS
PARTICLE MODELS
SEMIMETALS
STATISTICAL MODELS
USA
VARIATIONS
WATER
WETLANDS
580000* - Geosciences