Anion separation using potassium hydroxide eluent

Alternatively, a strongly conducting eluent may be used. In this case, elution of the solute ions is associated with a negative conductivity change. This indirect detection method is applied to the separation of anions with a potassium hydroxide eluent [7]. A corresponding chromatogram is displayed in Figure 8.2. This indirect detection method is also utilized in the analysis of mono- and divalent cations, which are eluted by dilute nitric acid or nitric acid/ethylenediamine mixtures. 

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