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This article in SSSAJ

  1. Vol. 52 No. 6, p. 1621-1623
    Received: Feb 29, 1988

    * Corresponding author(s):
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Nonbiological Nitrous Oxide Production from Vadose Soil Catalyzed by Galvanized Steel Tubing

  1. T. B. Parkin  and
  2. E. E. Codling
  1. USDA-ARS, Environmental Chemistry Lab., Building 007, Room 229, BARC-WEST, Beltsville, MD 20705



Studies of microbial processes in the vadose zone are hampered by difficulties in obtaining uncontaminated samples. We initiated a study in 1985 to quantify microbial denitrification in the vadose zone of agricultural land located in the Atlantic Coastal Plain. In the initial stages of this study, deep soil cores (360 cm) were collected and subcored with sterile galvanized steel tubes to eliminate contamination by surface soil. We observed N2O production from subsoil incubated with C2H2 in galvanized tubes, but in the same soil incubated anaerobically with added glucose and NO3, denitrification activity was not detected. Subsequent comparisons of N2O production in surface and subsurface soil incubated in galvanized and plastic tubes indicated that chemodenitrification was the likely mechanism responsible for the N2O production observed in soil contained in galvanized steel tubes. These results suggest that, in field or laboratory experiments designed to investigate soil-N transformations, galvanized steel enclosures should be used with caution.

Contribution from the USDA-ARS, Environmental Chemistry Lab.

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