PHYSICO-CHEMICAL STUDY OF ANIONS ON SOIL COLLOIDS AND CLAYS.

Abstract

This study is mainly concerned with adsorption of H3 B03 on:

pure clay and non-clay minerals (kaolinite, bentonite, palygorskite and muscovite). Soil clays separated from calcareous, Nile alluvial and lacustrine soils.

-X-Ray diffraction analysis indicates that montmorillonite is the major constituents clay fraction of clay of the El-Tina plain soils followed by kaolinite quartz and mica. montmorillonite, kaolinite, palgorskite and illite dominated the clay fraction of Wadi El-Arish soils. montmorillonite, kaolinite and quartz are the major constituents of the clay fraction of the Bitter Lakes soils.

The Obtained results reveal the following:

Adsorption ofB on pure clay minerals increases in the order:

kaolinite< palygorskite < bentonite <muscovite.

Boron adsorption increases with increasing solution pH, exhibits maximum adsorption around pH 9.5 and decreases with further increases in solution pH. Boron adsorption is correlated with aluminum , iron oxides removal and organic matter decreases with extractable aluminium and iron oxides and increase with the removal of organic matter.