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Original Articles

Application of centrifuging to heavy metal studies in soil solutions

Pages 1621-1636 | Published online: 11 Nov 2008
 

Abstract

A simple apparatus to extract soil solution by centrifuging from specific horizons has been devised and used to study the slow transfer of copper (Cu) and cadmium (Cd) within the soil when lysimetry is not possible or inefficient. It has been tested on the several horizons of two sandy soils fairly free of pollution, a Typic Dystrochrept and a Typic Haplorthod. With the same centrifugal speed, it extracted solution at suctions that depend on the horizons’ characteristics. It produced solution free of contamination and enabled small concentrations of heavy metals to be measured. Concentrations of Cu and Cd in the capillary water extracted are generally greater than the solutions collected by lysimetry and their evolution with time is also different. These solutions give an instantaneous view of the heavy metal concentration in the capillary fraction of the soil solution just after a rain.

Notes

This research is part of the Project No. 2000–5–231 supported by the Swiss National Foundation.

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