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Published in Soil Sci Soc Am J 30:697-699 (1966)
© 1966 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Adsorption-flocculation Reactions of Soil Polysaccharides with Kaolinite1

G. R. Saini and A. A. MacLean2

ABSTRACT

The adsorption of a soil polysaccharide by kaolinite saturated with different exchange cations was determined with polysaccharide tagged with C14. Adsorption followed the Langmiur equation. Adsorption increased with exchange cations with the effect of Fe3+ > Al3+ > H+ > Ca2+ > Mg2+ > Na+.

Filtration rates of kaolinite were also increased by saturating with different cations with the effect of Fe3+ > Al3+ > H+ Ca3+, Mg2+ > Na+. In a dispersed system, filtration rates increased with successive additions of polysaccharide and then decreased.

It is suggested that a segment rather than the whole polysaccharide molecule competed with the solvent molecule for surface sites whereby a fraction of the total segments was adsorbed and the remaining segments protruding from he interface were attached to free surface on an adjacent soild particle. With subsequent additions of polysaccharide, it is suggested that conditions were created whereby there was insufficient free surface for bridging or possibly the extended segments interfered physically with one another and prevented bridge formation.

NOTES

1 Contribution No. 216, Research Station, Canada Department of Agriculture, Fredericton, N. B. Presented before Div. S-2 Soil Science Society of America, Nov. 4, 1965, Columbus, Ohio.

2 Soil Physicist and Head, Soil Science Section, respectively.

Received for publication November 15, 1965. Accepted for publication August 17, 1966.






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