Organic acid eluents for single-column ion chromatography

Facilitated Dehydration of Rb+ Ions in Cation‐Exchange Resin when Surrounded by Cs+ Ions: A Marked Phenomenon in Superheated Water

“…Ion‐exchange chromatography is one of the most efficient methods for systematically studying the separation selectivity of ions . This method has allowed us to analyze the effects of various factors, such as ion‐exchange group structures, solvents, types of coexisting ions, and temperatures,,,,, on ion‐exchange selectivity. For example, anion‐exchange selectivity in water increases with an increase in the size of naked anions, regardless of the structure of the anion‐exchange groups (e. g. Cl − < Br − < I − < ClO 4 − ).…”

“…When discussing the chromatographic evaluation of ion‐exchange selectivity, it should be noted that chromatographic retention is measured with a tiny amount of solute ions in the presence of a large amount of eluent ions. It has been shown that the type of eluent ion has a greater impact on ion‐exchange selectivity compared to the structure of ion‐exchange groups in some cases . Structural information that was obtained from resins with a single type of counterion may be inapplicable to the discussion of chromatographically evaluated ion‐exchange separation selectivity.…”

Anion Chromatography

“…These include succinic, nicotinic, salicylic, fumaric and citric acid [14]. Since the exchange and ionization equilibria are dynamic, approximately 80% of the H + needed to pair with the sample anion, A -, comes from molecular benzoic acid.…”

Determination of fluoride in various matrices

“…Separation of a range of anions including fluoride has been accomplished using organic acids such as succinic and nicotinic acids, the detection limits for fluoride being 26 and 5 pgL1 respectively (ref. 81). The reduction in the conductivity of potassium hydroxide eluent caused by the presence of eluted anions has been found to be more sensitive for the determination of anions on a single column than was the increase in conductivity when using potassium hydrogen phthalate as eluent (ref.…”