Readily dispersible clay and its role in the mobility of transition metals Cd super(2+), Cu super(2+) and Zn super(2+) in an alkaline alluvial soil

Readily dispersible clay and its role in the mobility of transition metals Cd super(2+), Cu super(2+) and Zn super(2+) in an alkaline alluvial soil

Readily dispersible clay is the part of the clay fraction in soils that potentially disperses in water when a small amount of mechanical energy is applied to soil. Column and batch experiments were conducted to identify the effect of readily dispersible clay on the mobility of some metal ions in a d...

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Veröffentlicht in:Environmental earth sciences 2014-05, Vol.71 (9), p.3855-3864
Hauptverfasser: Rashad, Mohamed, Elnaggar, Essam, Assaad, Faiz F
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Assaad, Faiz F
description Readily dispersible clay is the part of the clay fraction in soils that potentially disperses in water when a small amount of mechanical energy is applied to soil. Column and batch experiments were conducted to identify the effect of readily dispersible clay on the mobility of some metal ions in a disturbed soil sample. The clay fraction (
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Column and batch experiments were conducted to identify the effect of readily dispersible clay on the mobility of some metal ions in a disturbed soil sample. The clay fraction (&lt;0.002 mm) was separated from an alkaline Vertisol from the Nile River Delta. X-ray diffraction technique was used to identify minerals present in the clay fraction. Clay suspensions and deionized H sub(2)O solutions of Cd super(2+), Cu super(2+), and Zn super(2+) were prepared and used as influents in soil columns. Adsorption capability of the studied soil among the three metal ions was investigated. The results showed high adsorption capacity of Cd super(2+), Cu super(2+), but not Zn super(2+) for the studied soil. Cu super(2+) was the highest adsorbed metal by soil and its sorption increased at small equilibrium concentrations compared with Cd super(2+) and Zn super(2+). For the three studied metal ions, Langmuir model represented the best fit to the adsorption data. The concentration of Zn super(2+) and Cd super(2+) in leachates increased as the leaching solution volume increased, while Cu super(2+) showed a homogeneous distribution throughout the soil column. 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The concentration of Zn super(2+) and Cd super(2+) in leachates increased as the leaching solution volume increased, while Cu super(2+) showed a homogeneous distribution throughout the soil column. 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title Readily dispersible clay and its role in the mobility of transition metals Cd super(2+), Cu super(2+) and Zn super(2+) in an alkaline alluvial soil
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