Characterization of ion chromatography columns based on hydrophobicity and hydroxide eluent strength

Characterization of At− species in simple and biological media by high performance anion exchange chromatography coupled to gamma detector

“…A correction of the activity coefficients for the exchange species would be necessary, since the medium strongly influences the values of selectivity coefficients [25]. Also, the differences may be explained by means of hydrophilic character of resins: AS20 is highly hydrophilic while polystyrene-divinylbenzene resin is less hydrophilic [28].…”

Anion exchangers with branched functional ion exchange layers of different hydrophilicity for ion chromatography

“…The increase of the relative retention (k An /k Cl ) with the increase of stationary phase hydrophilicity is usually observed for highly hydrated ions, such as F -, while the opposite trend is typical for less hydrated ones (Br -, NO 3 etc.). This effect was observed by Liang and Lucy [35] for the set of agglomerated columns containing ion exchange groups of different hydrophilicity prepared in the work [34], and by Bruzzoniti et al [33], who also studied the changes of selectivity for A c c e p t e d M a n u s c r i p t stronger than divalent anions or coeluted with them from the anion exchanger having hydrophobic functional groups [12].…”

Graphene-coated polymeric anion exchangers for ion chromatography

“…All analytes were baseline separated with excellent peak symmetries. There is also very good resolution for fluoride/water dip, suggesting fairly high water content (hydrophilicity) among anion exchange functionalities [37]. The retention of these analytes is quite strong on AE100-3 (k Br -, 50mM OH up to 17.3), given that the measured capacity of this stationary phase is not outstanding.…”

“…Anion exchanger AE100-3 possesses a moderate-high capacity of 120.4 μequiv (150 × 4.6 mm i.d.). The ion exchange interaction of seven typical anions with anion exchanger AE100-3 was investigated based on Linear Solvent Strength Model [37].…”