Organic carbon causes interference to nitrate and nitrite measurements by UV/Vis spectrometers : The importance of local calibration

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Uusheimo , S A , Tulonen , T V , Arvola , L M J , Arola , H , Linjama , J & Huttula , T 2017 , ' Organic carbon causes interference to nitrate and nitrite measurements by UV/Vis spectrometers : The importance of local calibration ' , Environmental Monitoring and Assessment , vol. 189 , no. 357 , pp. 357 . https://doi.org/10.1007/s10661-017-6056-6

Title: Organic carbon causes interference to nitrate and nitrite measurements by UV/Vis spectrometers : The importance of local calibration
Author: Uusheimo, Sari Anneli; Tulonen, Tiina Valpuri; Arvola, Lauri Matti Juhani; Arola, Hanna; Linjama, Jarmo; Huttula, Timo
Contributor organization: Lammi Biological Station
Date: 2017-07-27
Language: eng
Number of pages: 10
Belongs to series: Environmental Monitoring and Assessment
ISSN: 0167-6369
DOI: https://doi.org/10.1007/s10661-017-6056-6
URI: http://hdl.handle.net/10138/308890
Abstract: Compared with sporadic conventional watersampling, continuous water-quality monitoring with opti-cal sensors has improved our understanding of freshwaterdynamics. The basic principle in photometric measure-ments is the incident light at a given wavelength that iseither reflected, scattered, or transmitted in the body ofwater. Here, we discuss the transmittance measurements.The amount of transmittance is inversely proportional tothe concentration of the substance measured. However, thetransmittance is subject to interference, because it can beaffected by factors other than the substance targeted in thewater. In this study, interference with the UV/Vis sensornitrate plus nitrite measurements caused by organic carbonwas evaluated. Total or dissolved organic carbon as well asnitrate plus nitrite concentrations were measured in variousboreal waters with two UV/Vis sensors (5-mm and 35-mmpathlengths), using conventional laboratory analysis re-sults as references. Organic carbon increased the sensornitrate plus nitrite results, not only in waters with highorganic carbon concentrations, but also at the lower con-centrations (< 10 mg C L−1) typical of boreal stream, river,and lake waters. Our results demonstrated that local cali-bration with multiple linear regression, including bothnitrate plus nitrite and dissolved organic carbon, can cor-rect the error caused by organic carbon. However, high-frequency optical sensors continue to be excellent tools forenvironmental monitoring when they are properly calibrat-ed for the local water matrix.
Subject: 1181 Ecology, evolutionary biology
Boreal water monitoring
Calibration
Nitrate
High-frequency sensor
Optical measurement
Organic carbon
Peer reviewed: Yes
Usage restriction: openAccess
Self-archived version: acceptedVersion


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