Zinc adsorption by andepts from the central plateau of Costa rica 1

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Abstract
The adsorption of Zn by soil and subsoil samples from the slopes of the Irazu and Poas volcanoes in Costa Rica was correlated with soil properties and represented by Langmuir isotherms. Soil pH, texture and free aluminum and sesquioxide content correlated significantly with Zn adsorption. No correlation with organic matter content was found probably due to the variable nature and properties of its compounds. The adsorption maxima ("b”; values) calculated by the Langmuir equation are higher for the soils developed on the more weathered Poas than for the more recent Irazu ash. The bonding energy constants ("K") followed a similar trend.