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    Technical Note: Field experiences using UV/VIS sensors for high-resolution monitoring of nitrate in groundwater

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    Author
    Huebsch, Manuela
    Grimmeisen, F.
    Zemann, M.
    Fenton, Owen
    Richards, Karl G.
    Jordan, Philip
    Sawarieh, A.
    Blum, P.
    Goldscheider, N.
    Keyword
    UV/VIS sensors
    Groundwater nitrate monitoring
    Spectrophotometers
    Accuracy
    Date
    02/04/2015
    
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    URI
    http://hdl.handle.net/11019/796
    Citation
    Huebsch, M., Grimmeisen, F., Zemann, M., Fenton, O., Richards, K. G., Jordan, P., Sawarieh, A., Blum, P., and Goldscheider, N.: Technical Note: Field experiences using UV/VIS sensors for high-resolution monitoring of nitrate in groundwater, Hydrol. Earth Syst. Sci., 19, 1589-1598, doi:10.5194/hess-19-1589-2015, 2015
    Abstract
    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.
    Funder
    Teagasc Walsh Fellowship Programme; German Federal Ministry of Education and Research
    Grant Number
    02WM1079-1086
    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.5194/hess-19-1589-2015
    Scopus Count
    Collections
    Environment, Soils & Land Use
    Environment, Soils & Land Use
    Environment, Soils & Land Use

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