USGS-OWQ: NFM 6.2.1-Lum: Dissolved-oxygen concentration, field measurement by luminescent sensor
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Official Method Name
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Dissolved Oxygen, Luminescent-Sensor Method |
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Current Revision
| Completed 01/24/2006 |
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Media
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WATER |
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Instrumentation
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Luminescence Sensor |
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Method Subcategory
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Inorganic |
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Method Source
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Citation
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Brief Method Summary
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Dissolved-oxygen measurement in natural water must be made in situ at the field site. The luminescent-sensor method specifies use of an instrument based on luminescent-sensor technology. The instrument calibration should be checked periodically in accordance with section 6.2.1B of the source citation. For surface-water measurements, the DO determination must be made in situ; refer to TWRI Book 9 Ch. A6.0 and Ch. A4 for isokinetic and nonisokinetic sampling methods. For ground-water measurements, the measurement must be made either downhole (in situ) at the given sampling interval, or within an air-tight flow-through chamber (cell) to which the sample is pumped directly from the downhole sampling interval; refer to TWRI Book 9 Ch. A6.0 and Ch. A4.2 for downhole and flow-through-chamber sampling methods. |
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Scope and Application
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This method covers the measurement of dissolved oxygen (DO) concentrations in surface water and ground water using luminescent-sensor technology. Standard USGS surface-water measurements represent the median or mean in-situ value of a reach cross section. Standard ground-water measurements are made either in situ (downhole) or pumped directly to flow-through cell to exclude contact with air. |
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Applicable Concentration Range
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1.0 to 20 |
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Interferences
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There are no known sources of interference to this method when used in situ in natural aquatic systems. |
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Quality Control Requirements
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Calibration checks are strongly recommended. |
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Sample Handling
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Measurements in surface water must be made in situ. Measurements in ground water are made either in situ (downhole) or in source water pumped into a flow-through cell, with sample temperature maintained constant from source to cell and excluding bubbles or other source of air. |
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Maximum Holding Time
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zero holding time |
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Relative Cost
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Unknown |
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Sample Preparation Methods
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not applicable |
