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UV-absorbance detector for HPLC based on a light-emitting diode
journal contribution
posted on 2023-05-17, 06:57 authored by Schmid, S, Miroslav MackaMiroslav Macka, Hauser, PCA flow-through optical absorption detector for HPLC was constructed using a novel deep-UV light-emitting diode as radiation source with a peak emission wavelength of 255 nm. For measuring the transmitted intensity (a property correlated to Transmittance) a special UV-sensitive photodiode was employed. Besides the power source, no optical or electronic components other than an inexpensive operational amplifier and a few passive components were necessary. The performance of the detector was tested with three substances, namely nitrobenzene, benzoic acid and methyl benzoate, which were separated by gradient elution using an acetonitrile/water mixture and tetrabutylammonium hydrogensulfate as pH-buffer. Calibration curves for concentrations between 1.6 mu g(.)mL(-1) and 400 mu g(.)mL(-1) (nitrobenzene) and 8 mu g(.)mL(-1) and 2.5 mg(.)mL(-1) (benzoic acid and methyl benzoate) were determined and coefficients of determination, r(2), of 0.9945, 0.9972 and 0.9996 were obtained for quadratic curve fits for the 3 compounds respectively. Relative standard deviations (n = 7) for peak areas were determined as 0.35% (nitrobenzene, 80 mu g(.)mL(-1)), 0.27% (benzoic acid, 400 mu g(.)mL(-1)) and 0.83% (methyl benzoate, 200 mu g(.)mL(-1)). The lower limits of detection were found to be 750 ng(.)mL(-1), 5.8 mu g(.)mL(-1) and 12 mu g(.)mL(-1) for nitrobenzene, benzoic acid and methyl benzoate respectively.
History
Publication title
The AnalystVolume
133Issue
4Pagination
465-469ISSN
0003-2654Department/School
School of Natural SciencesPublisher
Royal Soc ChemistryPlace of publication
Thomas Graham House, Science Park, Milton Rd, Cambridge, England, Cambs, Cb4 0WfRepository Status
- Restricted