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| Titel |
Technical Note: Field experiences using UV/VIS sensors for high-resolution monitoring of nitrate in groundwater |
| VerfasserIn |
M. Huebsch, F. Grimmeisen, M. Zemann, O. Fenton, K. G. Richards, P. Jordan, A. Sawarieh, P. Blum, N. Goldscheider |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 19, no. 4 ; Nr. 19, no. 4 (2015-04-02), S.1589-1598 |
| Datensatznummer |
250120672
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| Publikation (Nr.) |
 copernicus.org/hess-19-1589-2015.pdf |
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| Zusammenfassung |
| Two different in situ spectrophotometers are compared that were used in the
field to determine nitrate-nitrogen (NO3-N) concentrations at
two distinct spring discharge sites. One sensor was a double wavelength
spectrophotometer (DWS) and the other a multiple wavelength
spectrophotometer (MWS). The objective of the study was to review the
hardware options, determine ease of calibration, accuracy, influence of
additional substances and to assess positive and negative aspects of the two
sensors as well as troubleshooting and trade-offs. Both sensors are
sufficient to monitor highly time-resolved NO3-N concentrations
in emergent groundwater. However, the chosen path length of the sensors had
a significant influence on the sensitivity and the range of detectable
NO3-N. The accuracy of the calculated NO3-N concentrations
of the sensors can be affected if the content of additional substances such
as turbidity, organic matter, nitrite or hydrogen carbonate significantly
varies after the sensors have been calibrated to a particular water matrix.
The MWS offers more possibilities for calibration and error detection but
requires more expertise compared with the DWS. |
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