Dissolved oxygen measurements in aquatic environments: The effects of changing temperature and pressure on three sensor technologies

Corey D. Markfort, Miki Hondzo

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Dissolved oxygen (DO) is probably the most important parameter related to water quality and biological habitat in aquatic environments. In situ DO sensors are some of the most valuable tools used by scientists and engineers for the evaluation of water quality in aquatic ecosystems. Presently, we cannot accurately measure DO concentrations under variable temperature and pressure conditions. Pressure and temperature influence polarographic and optical type DO sensors compared to the standard Winkler titration method. Th is study combines laboratory and fi eld experiments to compare and quantify the accuracy and performance of commercially available macro and micro Clark-type oxygen sensors as well as optical sensing technology to the Winkler method under changing pressure and temperature conditions. Field measurements at various lake depths revealed sensor response time up to 11 min due to changes in water temperature, pressure, and DO concentration. Investigators should account for transient response in DO sensors before measurements are collected at a given location. We have developed an eff ective model to predict the transient response time for Clark-type oxygen sensors. The proposed procedure increases the accuracy of DO data collected in situ for profiling applications.

Original languageEnglish (US)
Pages (from-to)1766-1774
Number of pages9
JournalJournal of Environmental Quality
Volume38
Issue number4
DOIs
StatePublished - Jul 1 2009

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