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The excess adsorption isotherms of organic eluent components from solutions containing electrolytes on a C18-bonded stationary phase are investigated by frontal analysis in staircase mode. The excess adsorption of acetonitrile increases when NaHSO4, NaH2PO4, NaCl, or NaOAc is added to the eluent, but decreases upon addition of NaBr or NaClO4. The excess adsorption of acetonitrile increases in the...
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