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Titolo:
Mid-infrared quantum cascade lasers for flow injection analysis
Autore:
Lendl, B; Frank, J; Schindler, R; Muller, A; Beck, M; Faist, J;
Indirizzi:
Vienna Univ Technol, Inst Analyt Chem, A-1060 Vienna, Austria Vienna Univ Technol Vienna Austria A-1060 t Chem, A-1060 Vienna, Austria Univ Neuchatel, Inst Phys, CH-2000 Neuchatel, Switzerland Univ Neuchatel Neuchatel Switzerland CH-2000 2000 Neuchatel, Switzerland
Titolo Testata:
ANALYTICAL CHEMISTRY
fascicolo: 7, volume: 72, anno: 2000,
pagine: 1645 - 1648
SICI:
0003-2700(20000401)72:7<1645:MQCLFF>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
7
Recensione:
Indirizzi per estratti:
Indirizzo: Lendl, B Vienna Univ Technol, Inst Analyt Chem, A-1060 Vienna, Austria Vienna Univ Technol Vienna Austria A-1060 -1060 Vienna, Austria
Citazione:
B. Lendl et al., "Mid-infrared quantum cascade lasers for flow injection analysis", ANALYT CHEM, 72(7), 2000, pp. 1645-1648

Abstract

A Fabry-Perot quantum cascade laser (QCL) was used as a powerful light source for mid infrared (MIR) detection in flow injection analysis. The QCL lased at several wavelengths close to each other within a few wavenumbers (990-1010 cm(-1)), hence fitting well to the broad absorption bands of molecules in liquid phase. As compared with that of a state-of-the-art Fourier transform spectrometer, the signal-to-noise ratio could be improved by a factor of 50. Additionally, by using a QCL as the light source, optical path lengths of more than 100 mu m could be used even in aqueous matrixes which reduced the danger of cell clogging. In the example shown here phosphate was determined in Diet Coke samples. The now injection system used allowed the measurement of the sample at two pH values (5 and 13) at which the analyte was present as H2PO4- and PO43-, respectively. As the analytical readout thedifference in IR absorption of H2PO4- and PO43- at the laser wavelengths was taken. The FIA-QCL measurements were corroborated by ion chromatography which was used as a reference method.

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Documento generato il 05/04/20 alle ore 07:16:09