High Temperature Open Tubular Capillary Column Ion Chromatography.

Abstract

Construction and preliminary characterization of open tubular capillary column ion chromatography is described. Increasing the column temperature resulted in a dramatic increase of the column efficiency. Two different kinds of columns were developed and investigated for capillary ion chromatography. One was a 50µm i.d. fused silica capillary tubing, and another was a 50µm i.d. silica capillary coated with Latex particles (diameter: about 360nm). Both columns showed good separations of inorganic anions, although the capillary coated with Latex particles showed much larger retention than a bare silica capillary.

Capillary ion chromatography

“…Rather than going to smaller capillaries to solve the problem of slow mass transfer to the wall, Pyo et al [85] attempted a different and in some sense a more direct approach: increasing the diffusion coefficient of the analyte. They accomplished this by raising the column temperature as high as 1508C.…”

Open-tubular ion-exchange capillary electrochromatography of inorganic anions

“…Latex coated capillaries were used by Pyo et al 18 to separate inorganic anions by pressure-driven OT-LC. Fused silica capillaries were coated with AS5A latex particles to give coated OT columns containing IE sites at the capillary wall.…”

“…Latex-coated capillaries were used by Pyo et al 18 to separate inorganic anions by high temperature ion-exchange OT-LC. It can therefore be expected that the adsorbed particles will have two effects on the separation.…”

Direct Photothermal Measurement of Optical Absorption in a Flow System

“…It was possible to follow oxide or heptyl viologen formation or Cu deposition on Pt/Au electrodes. 18,19 We have had a longstanding interest in open tubular liquid/ ion chromatography, 20 where detection has been 21 and remains the bottleneck. 22 No HPLC technique can be considered complete without sensitive absorbance detection.…”