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This article in SSSAJ

  1. Vol. 45 No. 4, p. 739-744
     
    Received: Sept 16, 1980
    Published: July, 1981


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doi:10.2136/sssaj1981.03615995004500040013x

Cadmium Adsorption by Soils and Uptake by Plants as Affected by Soil Chemical Properties1

  1. M. B. McBride,
  2. L. D. Tyler and
  3. D. A. Hovde2

Abstract

Abstract

The quantity of Cd2+ adsorbed by soils from the northeastern USA was measured at a given equilibrium concentration (10−5M) of the metal in soil solution. This “retention capacity” was strongly related by a linear function to the exchangeable Ca2+ content of the soils. In addition, Cd2+ uptake by corn plants grown in these soils amended with 1-µg Cd2+/g of soil was measured and found to be related to the retention capacity of the soil for Cd2+ by a curvilinear function. Although organic matter and clay in soil were able to limit Cd2+ uptake by the plants, the best soil indicators of Cd2+ availability were the retention capacity and exchangeable base (mainly Ca2+) content. The ability of exchangeable bases to account for most of the variability in Cd2+ adsorption by the soils as well as uptake by the plants is attributed to the important role of Cd2+-Ca2+ exchange reactions in the soil.

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