Flow injection analysis with reticulated vitreous carbon flow-through electrodes

Abstract

The Reticulated Vitreous Carbon flow-through electrode Is demonstrated to be a useful detector for flow Injection analysis In both an amperometrlc and a coulometric mode of operation. A relative precision of a few ppt was achieved In the latter mode, but the sampling rate was limited to about 24 samples per hour. A liquid chromatographic internal sampling valve was used to inject the sample into the supporting electrolyte stream. With amperometric operation, sampling rates as high as 264 samples per hour were achieved with a relative precision of ±0.5%. A peak current detector is described which stores the peak current In a 10-bit A/D converter. The reduction of ferricyanide ion and the oxidation of ascorbic acid, epinephrine, and L-Dopa were investigated. Detection limits for these analytes are a few tenths of a nanogram.

Reticulated vitreous carbon as an electrode material

“…5(a) shows an electrochemical cell using an RVC electrode in the flow-through configuration; the electrolyte and current flow are parallel. This mode of operation has been used in many electrochemical applications [15][16][17][18][19][20][21]. [12].…”

Carbon Felt-based Bioelectrocatalytic Flow Detectors: Highly Sensitive Amperometric Determination of Hydrogen Peroxide Using Adsorbed Peroxidase and Thionine

“…[1][2][3][4][5] A low diffusion barrier of porous electrode facilitates mass transport, and a high surface area enables a higher electrolytic efficiency, leading to a high sensitivity. Up to now, a reticulated vitreous carbon (RVC) has been successfully introduced to an electrochemical detector unit in a flowinjection analysis (FIA) system.…”

“…Up to now, a reticulated vitreous carbon (RVC) has been successfully introduced to an electrochemical detector unit in a flowinjection analysis (FIA) system. [1][2][3][4][5] On the other hand, a carbon felt (CF) is a microelectrode ensemble of micro carbon fiber (ca. 7 μm diameter), and possesses a random three-dimensional structure.…”

Immobilization of Tyrosinase on (3-Aminopropyl)triethoxysilane-Functionalized Carbon Felt-Based Flow-Through Detectors for Electrochemical Detection of Phenolic Compounds

“…The CF is an excellent candidate for the working electrode unit of the electrochemical flow--through detector 27,28 compared to other electroactive porous structures. [29][30][31] On account of these CF characteristics, the novel chemical immobilization strategy of TYR onto the CF surface has been established. In this study, the primary amino group (-NH 2 ) was induced onto the CF surface by using APTES.…”