EVALUATION OF CHEMICAL REMEDIATION TECHNIQUES OF P8-CONTAMINATED SOILS USING KINETIC APPROACH

Document Type : Original Article

Authors

Solis and Water Use Dept. and Plant nutrition Dept., National Research Centre, Dokkl, Cairo, Egypt

Abstract

This study investigated the effect of rock phosphate (RP). polyvinyl acetate
butyl acrylate emulsion 50% active material w/w (PVAc) and Humic acid (HA) as
natural and synthetic materials applied in remediation. and time of soil incubation on
rates of lead (Pb) desorption from three Egyptian soils. alluvial clay soil (Typ < /em>ic
torrens), calcareous soil (Typ < /em>ic calcids) and Sandy soil (Typ < /em>ic psamments), using
electrical stirred flow technique (ESFU). Lead fractionations in the studied soils were
also investigated after 2 and 16 weeks.
The obtained results showed that in all soil treatments, the applied materials
were significantly reduced the extractable fraction of Pb as in following order: HA>
RP> PVAc. In addition to that. the percentages of Pb extracted from the studied soils
by (NH4HC03) DTPA generally decreased wilh increasing time of soil incubation in
both amended and non-amended soil samples. Data of Pb distribution in different
fractions showed that reducing of Pb extracted from different soils may be attributed to
precipitation! adsorption of Pb. rendering Pb less available. The drtferent mechanisms
of remediation effects of the used matertals from kinetic study and Pb distribution in
different soils were discussed.

Keywords

Journal of Soil Sciences and Agricultural Engineering
Volume 30, Issue 7
July 2005
Pages 4303-4319

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