Abstract
Knowledge of adsorptive behavior of polymers is useful in predicting their mobility in soil, depth of effective treatment, and other factors related to soil physical conditions. Adsorption isotherms were determined by batch technique for six tritium labeled polymers on three soils, one of which was pretreated to create a high exchangeable sodium percentage (ESP) of 34, and on washed quartz sand of three size fractions. The three anionic polyacrylamide (PAM) compounds had negative charge density of 40J > 21J > 2J, and the three polysaccharide compounds (guar) had a higher positive charge (T-4141), a lower positive charge (CP-14), and a negative charge (T-4246). Adsorption of CP-14, 21J, and T-4246 was measured on montmorillonitic clay extracted from one soil and a specimen sample of montmorillonite clay. Adsorption of a given polymer on the low ESP soils was not significantly different, but was significantly higher on the high ESP soil. The adsorption isotherms were T-4141 ≥ 21J > CP-14 ≫ 40J ≥ 2J > T-4246, and adsorption on sand was only a little less than on soil. The adsorption on clay was CP-14 ≫ T-4246 > 21J. The data suggest that the PAM and guar polymers studied do not penetrate the aggregates, because adsorption was approximately the same for all soils of similar aggregate sizes. Molecular size, molecular conformation, and electrostatic charge each significantly affected the adsorption isotherms.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
