How do you test for dissolved oxygen in water?

Document ID

Document ID CO169

Version

Version 3.0

Status

Status Published

Published Date

Published Date 04/05/2018
Question
How do you test for dissolved oxygen in water?
Summary
There are several techniques available for measuring dissolved oxygen (DO):  titrimetric, colorimetric, electrochemical, and optical. 
Answer
There are several techniques available for measuring dissolved oxygen (DO):  titrimetric, colorimetric, electrochemical, and optical.  While the Winkler titration is the traditional test method for DO, it is cumbersome and can be difficult.  Colorimetric measurements use a spectrophotometer to measure the color change when DO reacts with an indicator.  The most common and easiest DO techniques are electrochemical and optical probes.  And the optical probe is the easiest of the probe techniques.  In an optical DO probe a luminescent dye is illuminated with a blue light.  In the presence of DO, the light emitted from the excited dye has a characteristic wavelength.  The intensity of that emitted light can be measured and used to calculate DO concentration of the water.  Luminescent dissolved oxygen (LDO) technology is a simple, accurate, low-maintenance solution for portable, laboratory, and process DO analyses.
 

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