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Paired emitter-detector diode detection with dual wavelength monitoring for enhanced sensitivity to transition metals in ion chromatography with post-column reaction
Citation
O'Toole, M and Barron, L and Shepherd, R and Paull, B and Nesterenko, PN and Diamond, D, Paired emitter-detector diode detection with dual wavelength monitoring for enhanced sensitivity to transition metals in ion chromatography with post-column reaction, The Analyst, 134, (1) pp. 124-130. ISSN 0003-2654 (2009) [Refereed Article]
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Copyright Statement
Copyright � The Royal Society of Chemistry 2009
Official URL: http://www.rsc.org/
DOI: doi:10.1039/b812612g
Abstract
The combination of post-column derivatisation and visible detection are regularly employed in ion chromatography (IC) to detect poorly absorbing species. Although this mode is often highly sensitive, one disadvantage is the increase in repeating baseline artifacts associated with out-of-sync pumping systems. The work presented here will demonstrate the use of a second generation design paired emitter�detector diode (PEDD-II) detection mode offering enhanced sensitivity to transition metals in IC by markedly reducing this problem and also by improving signal noise. First generation designs demonstrated the use of a single integrated PEDD detector cell as a simple, small (15 � 5 mm), highly sensitive, low cost photometric detector for the detection of metals in IC. The basic principle of this detection mode lies in the employment of two linear light emitting diodes (LEDs), one operating in normal mode as a light source and the other in reverse bias serving as a light detector. The second generation PEDD-II design showed increased sensitivity for Mn(II)- and Co(II)-2-(pyridylazo)resorcinol (PAR) complexes as a result of two simultaneously acquiring detection cells � one analytical PEDD cell and one reference PEDD cell. Therefore, the PEDD-II employs two wavelengths whereby one monitors the analyte reaction product and the second monitors a wavelength close to the isosbestic point. The optimum LED wavelength to be used for the analytical cell was investigated to maximise peak response. The fabrication process for both the analytical and reference PEDD cells was validated by determining the reproducibility of detectors within a batch. The reproducibility and sensitivity of the PEDD-II detector was then investigated using signals obtained from both intra- and inter-day chromatograms.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Research Division: | Chemical Sciences |
| Research Group: | Analytical chemistry |
| Research Field: | Separation science |
| Objective Division: | Expanding Knowledge |
| Objective Group: | Expanding knowledge |
| Objective Field: | Expanding knowledge in the chemical sciences |
| UTAS Author: | Paull, B (Professor Brett Paull) |
| UTAS Author: | Nesterenko, PN (Professor Pavel Nesterenko) |
| ID Code: | 59909 |
| Year Published: | 2009 |
| Web of Science® Times Cited: | 15 |
| Deposited By: | Austn Centre for Research in Separation Science |
| Deposited On: | 2009-12-21 |
| Last Modified: | 2015-02-07 |
| Downloads: | 0 |
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