the chromatographic determination of components in liquid samples, particularly from low lonenkonzentrationen in aqueous samples by lonenchromatographie with aqueous eluenten is the test sample in a reinstlu00f6sungsmittel reinstwasserstrom attached unm ittelbar before the column, with correspondingly higher concentrated eluenten is mixed.alternatively, the ions are fixed beforehand in a adsorber and higher concentrated eluenten eluted, which, in turn, before the column, with reinstwasser to achieve the necessary concentration for the lonenchromatographie is mixed.for such a voranreicherung are two small voranreicherungssu00e4ulen appropriate to analysenzyklus by analysenzyklus alternating in inverse direction from probenhaltigen reinstwasser or aufkonzentrierten eluenten passes.an additional cleaning of reinstwasser and eluentenzustrom and pulsationsdu00e4mpfung by between eluentenzweig and reinstwasserzweig a twin headed fu00f6rderpumpe provided for each adjacent membrane of approximately 1.5 - to 2-fold equalisation volume of pumpenhubs are g u00fcnstig.
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