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Effects of Soil and Water Properties on Anionic Polyacrylamide Sorption

Dep. Environmental Sciences, Univ. of California, Riverside, CA 92521

View larger version (19K): [in a new window]   Fig. 1. PAM sorption isotherms by sand and clay minerals under various salt concentrations. PAM solutions were prepared in: (i) • DI (deionized) water; (ii) 0.002 M NaCl; (iii) 0.010 M NaCl; (iv) 0.001 M CaCl2; and (v) 0.005 M CaCl2. Each data point is the mean of two replicates and error bar is its average deviation. Solid line is fitted Langmuir sorption isotherm.

View larger version (36K): [in a new window]   Fig. 2. PAM sorption isotherms by the six test soils under various salt concentrations. PAM solutions were prepared in: (i) • DI (deionized) water; (ii) 0.002 M NaCl; (iii) 0.010 M NaCl; (iv) 0.001 M CaCl2; and (v) 0.005 M CaCl2. Each data point is the mean of two replicates and error bar is its average deviation. Solid line is fitted Langmuir sorption isotherm.

View larger version (25K): [in a new window]   Fig. 3. Influence of salt concentrations on the amount of PAM saturation sorption.

View larger version (24K): [in a new window]   Fig. 4. Effect of organic matter on the amount of PAM saturation sorption. The same symbol in the graph represents the same soil, but different OM contents.