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Metallo-Organic Interactions Associated with Podzolization¹

ABSTRACT

Leaching a calcareous soil parent material with a chelating agent caused the mobilization, transport, and redeposition of iron and aluminum resulting in the formation of a profile similar to those of certain podzolic soils. Under natural conditions, fulvic acid is considered to be the dominant ligand effecting the translocation of iron and aluminum in the podzolization process. Oxidative degradation studies and infrared and functional group analyses suggest that fulvic acid consists of an aromatic "nucleus" to which carboxyls, hydroxyls, and carbonyls are attached as the main functional groups. There is a strong possibility that on its path down the profile this fulvic acid forms, at first, water-soluble multidentate chelates with metals such as iron and aluminum, etc., and that precipitation of these metallo-organic complexes lower in the profile is effected by further reaction with the same metals and by extremely small amounts of ionic Ca²⁺ and/or Mg²⁺.

¹ Contribution No. 50, Soil Research Institute, Research Branch, Canada Department of Agriculture, Ottawa. Presented before Div. III, Soil Science Society of America, St. Louis, Mo., Nov. 28, 1961.

² Research Officers. The senior author is now Director, Research Station, Kentville, Nova Scotia.

Received for publication April 24, 1962. Accepted for publication July 16, 1962.