Fig. 11

Adsorption behavior of HPAM, xanthan gum (XGU), guar gum (GGU), and basil seed gum (BSG) on sandstone as a function of polymer concentration at different salinity levels: (a) 0 ppm NaCl (distilled water), (b) 7,000 ppm NaCl, (c) 20,000 ppm NaCl, and (d) 50,1000 ppm NaCl.