Eluant octanesulfonic acid

Eluants and regenerants suitable for the analysis of organic adds when applying an AFS-2 hollow fiber membrane suppressor are listed in Table 5-2. For the analysis of borate and carbonate with an octanesulfonic acid eluant, an ammonium hydroxide solution with a concentration c = 10 mmol/L can also be used as the regenerant. 

Fig. 5-6. Separation of borate and carbonate by ion-exclusion chromatography. — Separator column lonPac ICE-ASl eluant 1 mmol/L octanesulfonic acid flow rate 1 mL/min detection suppressed conductivity injection volume 50 pL solute concentrations 10 mg/L borate (1) and 50 mg/L carbonate (2).

As an example, Fig. 6-26 shows the separation of mono-, di-, and tri-ethyl-amine, accomplished by using octanesulfonic add as the ion-pair reagent The less hydrophobic hexanesulfonic acid is used in combination with boric add as the eluant for the separation of ethanolamines, as shown in Fig. 6-27. These compounds are detected by measuring the electrical conductivity, so the background conductivity is generally lowered with a membrane suppressor. The addition of boric acid to both the eluant and the regenerant serves to enhance the sensitivity for di- and tri-ethanolamine. 

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