Technical Note: Field experiences using UV/VIS sensors for high-resolution monitoring of nitrate in groundwater
| Autor: | Owen Fenton, Phil Jordan, Felix Grimmeisen, Ali Sawarieh, Manuela Huebsch, Nico Goldscheider, Karl G. Richards, Moritz Zemann, Philipp Blum |
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| Přispěvatelé: | Teagasc Walsh Fellowship Programme, German Federal Ministry of Education and Research, 02WM1079-1086 |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Spectrophotometers
Geography & travel UV/VIS sensors lcsh:Technology lcsh:TD1-1066 chemistry.chemical_compound Ultraviolet visible spectroscopy Path length Nitrate Groundwater nitrate monitoring Calibration Sensitivity (control systems) lcsh:Environmental technology. Sanitary engineering Turbidity lcsh:Environmental sciences Accuracy Remote sensing ddc:910 lcsh:GE1-350 Hydrology lcsh:T lcsh:Geography. Anthropology. Recreation Wavelength lcsh:G chemistry Environmental science Groundwater |
| Zdroj: | Hydrology and earth system sciences, 19 (4), 1589-1598 Hydrology and Earth System Sciences, Vol 19, Iss 4, Pp 1589-1598 (2015) Hydrology and earth system sciences discussions, 11 (11), 12291-12314 |
| ISSN: | 1079-1086 1027-5606 1607-7938 1812-2108 1812-2116 |
| DOI: | 10.5445/ir/1000045811 |
| Popis: | peer-reviewed 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. The authors would like to acknowledge the Teagasc Walsh Fellowship scheme for funding the study in Ireland, and the German federal Ministry of Education and Research (BMBF) for sponsoring the SMART-project (grant no. 02WM1079-1086, 02WM1211-1212) for the study in Jordan. Teagasc Walsh Fellowship Programme |
| Databáze: | OpenAIRE |
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