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(a) Adsorption rates of pentobarbital in phosphate buffer solution. CPentobarbital =0.6 mg/ml; the adsorbent to solution ratio was 120 (v/v). (b) Adsorption rates of free cholic acid in phosphate buffer solution: CCA = 0.15 mg/ml; the adsorbent to solution ratio was 150 (v/v).
