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Polyacrylamide Distribution in Columns of Organic Matter–Removed Soils following Surface Application

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

View larger version (27K): [in a new window]   Fig. 1. Distribution of polyacrylamide (PAM) as a function of depth in a soil column packed with (a) organic matter (OM)–removed Hanford sandy loam and (b) OM-removed Imperial silty clay. Results were obtained 48 h after the 8-cm ponded application (40 mg L-1 PAM solution).

View larger version (25K): [in a new window]   Fig. 2. Distribution of polyacrylamide (PAM) with soil depth under different application concentrations of PAM. Results were obtained 48 h after the 8-cm ponded application. The soil was the organic matter (OM)–removed Hanford sandy loam and the salt level was 0.001 M CaCl2.

View larger version (33K): [in a new window]   Fig. 3. Polyacrylamide (PAM) sorption isotherms on the two organic matter (OM)–removed soils under various salt concentrations. Each data point is the mean of two replicates and the solid line is the fitted Langmuir sorption isotherm.

View larger version (27K): [in a new window]   Fig. 4. Distribution of polyacrylamide (PAM) as a function of depth in a soil column packed with the organic matter (OM)–removed Hanford sandy loam. Results were obtained 48 h after the 8-cm drip application (40 mg L-1 PAM solution).

View larger version (25K): [in a new window]   Fig. 5. The effects of initial soil water content on the distribution of polyacrylamide (PAM) with soil depth. Results were obtained 48 h after the 8-cm ponded application (40 mg L-1 PAM solution). The soil was the organic matter (OM)–removed Hanford sandy loam and the salt level in the applied PAM solution was 0.001 M CaCl2.