University of Khartoum

Desorption of Polyacrylamide and Polysaccharide Polymers from Soil Materials

Desorption of Polyacrylamide and Polysaccharide Polymers from Soil Materials

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Title: Desorption of Polyacrylamide and Polysaccharide Polymers from Soil Materials
Author: Malik,Nasr Malik
Abstract: Quantitative information on adsorption-desorption of polymers on soil helps in predicting the depth of effective poly-mer treatment. Desorption of six tri-tium labeled polymers from three soils and an acid washed quartz sand was measured. Three anionic polyacrylamide (PAM) polymers whose charge density was in the order of 40J>21J>2J; two cation polysaccharide (guar) polymers whose charge density was greater for T-4141 than for CP-14; and an an-ionic polysaccharide (T-4246) were inves-tigated. After 30 g of soil has been equi-librated with 20 mL of polymer solution, the supernatant was replaced by distilled water and the amount of polymer des-orbed was calculated. Additionally, one soil was dried under the laboratory hood after decanting the supernatant before adding distilled water. Very little or no desorption occurred when the material was kept wet. All 2J and 59 to 76 per-cent of the other polymers left in solu-tion after decanting became irreversibly bonded to the soil by drying the soil.
URI: http://hdl.handle.net/123456789/6847
Date: 1992


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