Dissolved Oxygen Detection
Dissolved Oxygen Detection - Related Videos
09:38
Dissolved Oxygen in Surface Water
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2023
Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University Dissolved oxygen (DO) measurements calculate the amount of gaseous oxygen dissolved in surface water, which is important to all oxygen-breathing life in river ecosystems, including fish species preferred for human consumption (e.g. bluegill and bass), as well as decomposer species critical to the recycling of biogeochemical materials in the system. The oxygen dissolved in lakes, rivers, and oceans is crucial for the...
06:20
A Simple Approach to Manipulate Dissolved Oxygen for Animal Behavior Observations
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Cited by 1 •
2016
This article describes a simple and reproducible protocol to manipulate dissolved oxygen conditions in a laboratory setting for animal behavior studies. This protocol may be used in both teaching and research laboratory settings to evaluate organismal response of macroinvertebrates, fishes, or amphibians to changes in dissolved oxygen concentration.
09:08
Detecting Reactive Oxygen Species
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2023
Reactive oxygen species are chemically active, oxygen-derived molecules capable of oxidizing other molecules. Because of their reactive nature, there are many deleterious effects associated with unchecked ROS production, including structural damage to DNA and other biological molecules. However, ROS can also be mediators of physiological signaling. There is accumulating evidence that ROS play significant roles in everything from activation of transcription factors to the mediation of...
07:17
Production and Detection of Reactive Oxygen Species (ROS) in Cancers
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Cited by 278 •
2011
Here we propose simple methods to test and evaluate the presence of reactive oxygen species in cells.
08:58
Cerebral Blood Oxygenation Measurement Based on Oxygen-dependent Quenching of Phosphorescence
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Cited by 28 •
2011
We present an experimental procedure for measuring the partial pressure of oxygen (pO2) in cerebral vasculature based on oxygen-dependent quenching of phosphorescence. Animal preparation and imaging procedures were outlined for both large field of view CCD-based imaging of pO2 in rats and 2-photon excitation based imaging of pO2 in mice.
FAQs
At the sensor’s cathode, dissolved oxygen undergoes a reduction reaction that produces an electrical current. The measured current is related to the oxygen concentration in the water, allowing the instrument to translate an electrochemical response into a dissolved oxygen result. This mechanism is useful when monitoring changes in water quality through repeated quantitative measurements.
Optical sensors use a luminescent dye whose emission is quenched by oxygen. The degree of quenching provides information about the oxygen level, whereas electrochemical sensors infer concentration from current generated during oxygen reduction at a cathode. These approaches therefore rely on different signal mechanisms while serving the same environmental monitoring purpose.
Temperature and salinity can influence dissolved oxygen conditions, so measurements should be interpreted alongside these environmental variables. A change in oxygen concentration may reflect altered physical conditions rather than a single pollution source. Considering them improves interpretation of water-quality trends in rivers, lakes, wastewater systems, and aquaculture environments.
Microbial respiration and chemical oxygen demand are processes associated with changes in available oxygen. Dissolved oxygen measurements can reveal these changes by showing whether oxygen conditions shift as biological activity or oxygen-consuming chemical processes affect the water. This information helps evaluate whether an aquatic system can continue supporting organisms that require aerobic conditions.
In wastewater treatment, measurements help assess oxygen conditions associated with treatment performance and water quality. In eutrophication studies, they help identify oxygen changes linked to nutrient-related environmental deterioration. The same measurements can also reveal pollution effects, giving researchers a way to connect oxygen conditions with broader changes in aquatic ecosystem health.
The choice depends on the measurement mechanism and the monitoring context. Electrochemical systems relate oxygen reduction at a cathode to current, while optical systems use oxygen-dependent luminescence quenching. Both can support environmental assessment, so researchers may select the approach that best fits the water-quality study, whether it concerns wastewater, natural waters, or aquaculture.