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Evaluating the accuracy of two: In situ optical sensors to estimate DOC concentrations for drinking water production

Hoffmeister, S.; Murphy, K. R.; Cascone, C.; Ledesma, J. L. J.; Köhler, S. J.

Two in situ optical sensors, a single-excitation fluorescence-based sensor (fDOM) mounted on a multi-parameter EXO2 sonde (YSI), and a stand-alone, multispectral absorbance-based instrument (spectro::lyser, scan Messtechnik GmbH), were evaluated for their capability to (i) estimate river dissolved organic carbon (DOC) concentrations and (ii) provide oversight of drinking water production. The sensors were deployed between March and November 2017 in the river Fyris, which drains a mixed forested and agricultural 2003 km$^{2}$ catchment and serves as a drinking water source by managed aquifer recharge. Grab samples were collected every 2 to 3 weeks and compared with logged sensor data collected at 15 minute intervals. The fDOM probe signal was used to estimate DOC concentrations in the range of 10.4 to 24.4 mg L$^{-1}$ using linear regression (R$^{2}$ = 0.71, RMSE = 2.5 mg L$^{-1}$), after correction for temperature, turbidity and inner-filter effects. Temporal changes in DOC character associated with the mixed land use landscape, as indicated by optical indices, reduced this sensor accuracy for estimating DOC concentration. Nevertheless, humic substance concentrations, the fraction of DOC that is preferentially removed during artificial infiltration, were well captured. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000125544
Veröffentlicht am 31.10.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Wasser und Gewässerentwicklung (IWG)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 10.2020
Sprache Englisch
Identifikator ISSN: 2053-1400, 2053-1419
KITopen-ID: 1000125544
Erschienen in Environmental science / Water research & technology
Band 6
Heft 10
Seiten 2891–2901
Vorab online veröffentlicht am 02.09.2020
Nachgewiesen in Scopus
Web of Science
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