Fast separations with open tubular ion exchange capillary columns

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Abstract
Fused silica columns of 4.6 μm i.d. were coated with 3‐sulfopropylsilane as a cation exchanger and 3‐(2‐aminoethyl‐amino)‐propylsilane as an anion exchanger. Fast separations of cations (< 25 seconds) and of anions (< 35 seconds) were obtained, using a potentiometric microelectrode as a detector. In proceeding towards smaller i.d.s, a mixture of alkali metal cations could be separated successfully in an uncoated fused silica capillary of 2.3 μm i.d. as a result of retention by the surface silanol groups at pH 9.4.