Capillary Ion Chromatography at High Pressure and Temperature

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• 作者：Bert Wouters ; Cees Bruggink ; Gert Desmet ; Yury Agroskin ; Christopher A. Pohl ; Sebastiaan Eeltink
• 刊名：Analytical Chemistry
• 出版年：2012
• 出版时间：August 21, 2012
• 年：2012
• 卷：84
• 期：16
• 页码：7212-7217
• 全文大小：291K
• 年卷期：v.84,no.16(August 21, 2012)
• ISSN：1520-6882

文摘

The application of high pressure and temperature in ion chromatography (IC) can significantly improve the efficiency and reduce the analysis time. In this work, the kinetic-performance limits of capillary IC columns with inner diameters of 400 渭m packed with 4 and 7 渭m macroporous anion-exchange particles were investigated employing a capillary ion-exchange instrument allowing column pressures up to 34 MPa and column temperatures up to 80 掳C. Plate heights below 10 渭m could be realized using capillary columns packed with 4 渭m particles. Compared to conventional IC using 7 渭m particles and pressures up to 21 MPa, a 40% improvement in plate number could be achieved when working at the kinetic performance limits at 34 MPa and using columns packed with 4 渭m particles. Using coupled columns with a total length of 400 mm, a mixture of seven anions was separated within 7.5 min while yielding 20鈥?00 plates. Increasing the temperature improved the performance limits when operating in the C-term region (for fast IC separation using columns <75 cm). Temperature also affected the retention properties and hence the selectivity. At higher temperature, retention for monovalent ions was mainly governed by ion diameter. An increase in retention with temperature was observed for small ions, and there was a decrease for ions having a larger diameter. The retention factor for divalent and trivalent anions increased with temperature.