Dissolved Oxygen Measurement
Dissolved Oxygen Measurement - 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.
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.
01:19
Special considerations while measuring oxygen saturation
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2024
Assessing respiratory rate concurrently with pulse measurement is fundamental to patient care, providing valuable insights into the patient's respiratory function. The normal breathing rate for an adult usually falls within a normal range of 12 to 20 breaths per minute. Abnormal respiratory rates can signal underlying health conditions or the need for immediate intervention. Ensuring accuracy in vital sign recordings while prioritizing patient comfort and minimizing anxiety is important.
04:02
Measurement of Oxygen Consumption Rate in Acute Mouse Brain Slices
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2025
Source: Zhi, L. et al., Measurement of Oxygen Consumption Rate in Acute Striatal Slices from Adult Mice. J. Vis. Exp. (2022).This video demonstrates how to measure mitochondrial oxygen consumption rate (OCR) in mouse striatal brain slices. It details the steps for preparing the tissue plate and sensor cartridge, loading them into the flux analyzer, and explains the cellular processes underlying OCR patterns.
FAQs
An electrochemical sensor detects the current produced when dissolved oxygen is reduced at a cathode. The measured current provides the basis for estimating oxygen concentration in the sample. Because the signal depends on measurement conditions, reliable interpretation requires calibration and attention to variables such as temperature and pressure rather than treating the current as an unqualified concentration value.
Optical probes infer oxygen concentration from oxygen-dependent quenching of a luminescent signal. In contrast, electrochemical sensors rely on the current generated by oxygen reduction at a cathode. This distinction gives environmental scientists two different measurement principles for the same water-quality variable, allowing method selection according to the monitoring situation and the conditions under which data will be collected.
Temperature and pressure must be controlled or accounted for because they influence the oxygen measurement. A reading collected without attention to these conditions may not represent the actual oxygen status reliably. Calibration under relevant conditions therefore supports meaningful comparisons among samples, sites, or monitoring periods, which is essential when evaluating ecosystem health, pollution, or environmental change.
Researchers should select an appropriate sensor method, calibrate the instrument, and carefully control temperature and pressure during measurement. They can use either an electrochemical sensor or an optical probe, depending on the monitoring context. Applying these controls helps produce oxygen data that can support interpretation of respiration, photosynthetic activity, organic pollution, and eutrophication rather than isolated, poorly comparable readings.
Changes in oxygen concentration can provide evidence of respiration and photosynthetic activity. Respiration affects oxygen availability, while photosynthetic activity contributes to oxygen conditions in aquatic environments. Interpreting measurements in this biological context helps scientists assess ecosystem functioning and understand conditions experienced by fish and microbial communities, without relying on oxygen concentration as a purely chemical measurement.
Environmental scientists use oxygen data to investigate organic pollution, eutrophication, and wastewater treatment performance. The measurements also help identify conditions that may affect fish and microbial communities. These applications connect sensor readings with practical decisions in pollution control and ecosystem management, while repeated monitoring can contribute to studies of environmental change and changing water-quality conditions.