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Ion Chromatographic Determination of Hydroxide Ion on Monolithic Reversed-phase Silica Gel Columns Coated with Nonionic and Cationic Surfactants by Qun Xu; Masanobu Mori; Kazuhiko Tanaka; Mikaru Ikedo; Wenzhi Hu; Paul R Haddad is a Chemistry article available to read on EtoBox.

What is Ion Chromatographic Determination of Hydroxide Ion on Monolithic Reversed-phase Silica Gel Columns Coated with Nonionic and Cationic Surfactants about?

The determination of hydroxide by ion chromatography (IC) is demonstrated using a monolithic octadecylsilyl (ODS)-silica gel column coated first with a nonionic surfactant (polyoxyethylene (POE)) and then with a cationic surfactant (cetyltrimethylammonium bromide (CTAB)). This stationary phase, when used in conjunction with a 10 mmol/l sodium sulfate eluent at pH 8.2, was found to be suitable for the rapid and efficient separation of hydroxide from some other anions, based on a conventional ion-exchange mechanism. The peak directions and detection responses for these ions were in agreement with their known limiting equivalent ionic conductance values. Under these conditions, a linear calibration plot was obtained for hydroxide ion over the range 16 mol/l to 15 mmol/l, and the detection limit determined at a signal-to-noise ratio of 3 was 6.4 mol/l. The double-coated stationary phase described above was shown to be superior to a single coating of cetyltrimethylammonium bromide alone, in terms of separation efficiency and stability of the stationary phase. A range of samples comprising solutions of some strong and weak bases was analyzed by the proposed method and the results obtaine

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Author

Qun Xu; Masanobu Mori; Kazuhiko Tanaka; Mikaru Ikedo; Wenzhi Hu; Paul R Haddad

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1873-3778)

Published

2004

Language

EN

Field

Chemistry (Physical Sciences)