Abstract
A miniaturized analytical system for the separation and amperometric detection of toxic nitrophenols, based on the coupling of a micromachined capillary electrophoresis (CE) chip with a glassy carbon detector is described. This microsystem enables a rapid (120 s/sample) simultaneous determination of five priority nitrophenolic pollutants (2-nitrophenol, 3-nitrophenol, 4-nitrophenol, 2,4-dinitrophenol, and 2-methyl-4,6-dinitrophenol). These compounds can be detected down to the 1 × 10-5 M level using a 15 mM phosphate buffer pH 7.2 (containing 1.3 mM α-cyclodextrin) as running solution on 77 mm long microchannel by applying a separation voltage of 3000 V and a negative potential of -0.7 V (vs. Ag /AgCl wire). Applicability to ground water samples was demonstrated.
Original language | English |
---|---|
Pages (from-to) | 195-199 |
Number of pages | 5 |
Journal | Electroanalysis |
Volume | 18 |
Issue number | 2 |
DOIs | |
Publication status | Published - 1 Jan 2006 |
Externally published | Yes |
Keywords
- Amperometric detection
- Capillary electrophoresis
- Microchip
- Micromachining
- Nitrophenols
ASJC Scopus subject areas
- Analytical Chemistry
- Electrochemistry