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Anionic Polysaccharide Sorption by Clay Minerals

^a School of Nat. Resour., The Ohio State Univ., 2021 Coffey Rd., Columbus, OH 43210
^b Currently at the Univ. of Mississippi, duty station: U.S. Army Eng. Res. and Dev. Cent., 3909 Halls Ferry Rd., Vicksburg, MS 39180

View larger version (13K): [in a new window]   Fig. 1. Structure of xanthan (Sutherland, 1994).

View larger version (22K): [in a new window]   Fig. 2. Sorption of total organic C (TOC) by sample clays (see Table 1) at room temperature (18°C) as a function of the concentration of xanthan at pH 4, both in the (a) presence and (b) absence of 10 mmol L–1 Ca(NO3)2. Values are averages of 1 to 10 replications. Error bars are standard deviations of the means.

View larger version (20K): [in a new window]   Fig. 3. Adsorption of total organic C (TOC) by sample clays (see Table 1) from 100 mg L–1 solutions of xanthan at room temperature (18°C) as a function of Ca(NO3)2 concentration at pH (a) 4 and (b) 7. Values are averages of 1 to 10 replications. Error bars are standard deviations of the means.

View larger version (23K): [in a new window]   Fig. 4. Sorption of total organic C (TOC) from 100 mg L–1 solutions of xanthan by sample SAz-1 (montmorillonite) at pH 4 as a function of type of background electrolyte, as NO3– salts, and (a) ionic and (b) cationic strength of the solution.

View larger version (17K): [in a new window]   Fig. 5. Total organic C (TOC) sorption by KGa-1, SWy-1, and SAz-1 samples in a 100 mg L–1 solution of xanthan as a function of pH and concentration of Ca(NO3)2.

View larger version (20K): [in a new window]   Fig. 6. Sorption of total organic C (TOC) per unit of external surface area (SWy-1 excluded) from 100 mg L–1 solutions of xanthan at pH 4 with and without Ca(NO3)2 as a function of clay (a) cation exchange capacity (CEC), (b) percentage of octahedral charge, and (c) tetrahedral charge per unit cell.