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| Titel |
Field measurements of dissolved organic carbon in water using a new UV miniaturised Fourier Transform Spectrometer |
| VerfasserIn |
Paul Scholefield, Ali Hussain, Hugh Mortimer, Ed Tipping, Don Monteith, Jess Adams, Gloria Dos Santos Pereira |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250136637
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| Publikation (Nr.) |
 EGU/EGU2016-17728.pdf |
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| Zusammenfassung |
| We have developed a novel, highly portable and physically robust Fourier Transform Spectrometer working in the UV-VIS spectral region (250nm to 700nm) and configured to measure DOC concentrations in water in real time. We present details of the instrument’s components, optical configuration, and signal output.
Our new method eliminates the use of a fibre and the problems associated with it such as the higher absorption in the UV spectral region and optical coupling loss from the dip probe mirror. We use a free space approach by moving the flash lamp source away from the spectrometer and allowing for a cuvette or a flow cell be placed in the beam optical path. The optical absorption interaction occurs over a path length of 10mm but shorter path lengths can be used by changing the cell, so that more turbid samples can be analysed. This improved the instrument’s performance and accounted for the higher absorption in the deep UV from water containing higher concentrations of DOC.
We also present some initial test results based on water samples collected from a range of natural waters |
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