Dissolved oxygen is a vital parameter in the environmental monitoring of water quality. It is a great indicator of the general health of the ecosystem. Whether it is through organisms that die and decay or through pollution – it needs to be monitored.
What affects dissolved oxygen?
- Temperature
- Pressure
- Salinity
- Humidity
How do we measure dissolved oxygen?
- Iodometry
- Colorimetry
Which instruments are best for measuring dissolved oxygen?
Portable Meters
- HI98193
- HI98198
Benchtop Meters
- HI5421-02
- HI2040-02
Optical dissolved oxygen?
Optical dissolved oxygen still uses a probe to measure the dissolved oxygen, but instead of monitoring a reaction, the probe and meter monitor luminescence.
Simply, there is a blue light emitted by the probe, and the blue light excites the light sensitive material in the probe cap. As the material calms down, it releases a red light. The intensity, lifespan of the light (decay), and frequency of the red light are all dependent on the concentration of oxygen. Optical dissolved oxygen probes are also able to provide a continuous measurement of your sample. Optical dissolved oxygen probes are a bit more affected by humidity than other probes.
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