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- W2023126945 abstract "In the field of ion chromatography (IC) development, attention in recent years has been directed to the on-column modulation of the capacity of the separation column towards the targeted species. These increased efforts have been motivated by concern over the fact that the given capacity of a certain separation column for ions of low affinity is generally insufficient, but for ions of high affinity it is overabundant. The so-called capacity-gradient technique designed by Lamb and coworkers 1-4 was discussed in earlier reports concerning the on-column capacity modulating strategies. They established a macrocycle-based separation column, and observed that the column anion capacity was a function of the interaction occurring between the cation in eluent and the macrocycle group on the stationary phase. 1-4 Complex formation between borate compounds and vicinal diols is another strategy introduced by Yamamoto et al. 5 for the on-column modulation of the capacity. This technique was established based on the fact that most of the chemically bonded anion-exchange resin having hydroxyl groups on the resin surface; masking the hydroxyl groups by increasing concentration of the borate compound in the eluent could result in minimizing the apparent ion-exchange capacity of the column for anions. Another strategy presented by Sekiguchi and Suzuki at a local conference 6 also deserves mention. They used an anion-exchange column with crown-ether groups on the resin surfaces for anion separation, and observed that the column capacity was changeable by changing the eluent cation. The capacity effect of the eluent cation on the anion capacity of this kind of column was based on the fact that cations being held dynamically by the crown ethers made meaningful contributions to the anion separation. By using any of the above-mentioned techniques, anions of lower affinity could be base-line separated, yet the anions of high affinity could be forced to be eluted rapidly. Here, we report on a zwitterion-type anion separation column which was established by loading hexadecylphosphocholine micelles onto a reversed-phase octadecylsilica (ODS) stationary phase, by which the capacity for targeted ions could also be modulated on-column by simply switching the eluent cation." @default.
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- W2023126945 date "2002-11-01" @default.
- W2023126945 modified "2023-09-28" @default.
- W2023126945 title "Capacity Effects of the Eluent Cation on Anion Separation in Ion Chromatography Using Octadecylsilica Coated with Hexadecyiphosphocholine as the Stationary Phase." @default.
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- W2023126945 doi "https://doi.org/10.2116/analsci.18.1183" @default.
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