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Evaluating the accuracy of twoin situoptical sensors to estimate DOC concentrations for drinking water production

Hoffmeister, Svenja and Murphy, K. R. and Cascone, Claudia and Ledesma, Jose and Köhler, Stephan (2020). Evaluating the accuracy of twoin situoptical sensors to estimate DOC concentrations for drinking water production. Environmental Science: Water Research & Technology. 6 , 2891-2901
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Abstract

Twoin situoptical 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. The spectrolyser signal was used to establish a 2-component partial least square model that captured DOC fluctuations from 10.2 to 29.4 mg L-1(R-2= 0.92; RMSE = 1.3 mg L-1). This multiple-wavelength model (220 to 720 nm) effectively handled the changes in DOC composition while accurately estimating DOC concentrations. This study explores the advantages and limitations of optical sensors for their use in managed aquifer recharge and drinking water production in relation to DOC levels.

Authors/Creators:Hoffmeister, Svenja and Murphy, K. R. and Cascone, Claudia and Ledesma, Jose and Köhler, Stephan
Title:Evaluating the accuracy of twoin situoptical sensors to estimate DOC concentrations for drinking water production
Year of publishing :2020
Volume:6
Page range:2891-2901
Number of Pages:11
ISSN:2053-1400
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 201 Civil Engineering > Water Engineering
URN:NBN:urn:nbn:se:slu:epsilon-p-108165
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-108165
Additional ID:
Type of IDID
DOI10.1039/d0ew00150c
Web of Science (WoS)000574031300020
ID Code:17842
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:16 Oct 2020 10:40
Metadata Last Modified:16 Oct 2020 10:41

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