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Molecular absorption measurements with an optical fibre coupled array of ultra-violet light-emitting diodes

Bui, Duy Anh and Kraiczek, Karsten G. and Hauser, Peter C.. (2017) Molecular absorption measurements with an optical fibre coupled array of ultra-violet light-emitting diodes. Analytica Chimica Acta, 986. pp. 95-100.

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Official URL: http://edoc.unibas.ch/59010/

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Abstract

A photometric detector based on eight different light-emitting diodes covering the ultraviolet range from 255 nm to 350 nm is described. These are coupled with fused silica optical fibres to a conventional cuvette with 1 cm optical path length or to a low volume flow through cell for detection in high-performance liquid chromatography. Photodiodes are employed for the measurement of the transmitted intensity as well as of a reference signal and the photocurrents are processed with a log-ratio amplifier to obtain a voltage proportional to absorbance values. The wavelength desired for the measurement at hand is selected by electronically switching on the requisite light-emitting diode. The detector was found to have a low noise level of 80 mAU. In batch-wise measurements as well as in detection for high-performance liquid chromatography dynamic ranges of 2-3 orders of magnitude were possible. Reproducibilities in peak areas for the latter application were better than 1%.
Faculties and Departments:05 Faculty of Science > Departement Chemie > Chemie > Analytische Chemie (Hauser)
UniBasel Contributors:Hauser, Peter C. P. C.
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Elsevier
ISSN:0003-2670
e-ISSN:1873-4324
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:22 Jan 2018 14:57
Deposited On:22 Jan 2018 14:57

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