Table 2.

Effect of pH on the extent of adsorption of metronidazole (40 mg/20 ml buffer system) onto kaolin powder (5.0% w/v) at 37 °C.

pH	Amount of drug adsorbed (mg g−1)
1.2	10.07
2.0	17.87
4.2	25.67
6.8	25.89
8.0	29.5