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Ion chromatographic behavior of alkali metal cations and ammonium ion on various unmodified silica gel columns by elution with 2 mM nitric acid (pH 2.7) was investigated. As a result it was found that one silica gel (Develosil 30-5) column acted as a cation exchange column under acidic eluent conditions and an excellent separation of these cations was achieved. Therefore, in order to produce silica...
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