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USGS personnel collect a water-quality sample on the Missouri River. USGS/Photo by Kelly Brady.


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Chapter A6. Field Measurements

National Field Manual for the Collection of Water-Quality Data (TWRI Book 9)

6.2 Dissolved Oxygen

Revised By Stewart A. Rounds, Franceska D. Wilde, and George F. Ritz

This section of Chapter 6 is available as a pdf file:
6.2, Version 3.0 [655KB PDF]

Download a copy of Adobe Acrobat Reader for free.

[September, 2013 -- Version 3.0 incorporates the changes that were made to the method for computing dissolved-oxygen solubility, as described in Water Quality Technical Memorandum 2011.03 and implemented in version 3 of DOTABLES software http://water.usgs.gov/software/DOTABLES/].

Abstract

Accurate data for the concentration of dissolved oxygen in surface and ground waters are essential for documenting changes in environmental water resources that result from natural phenomena and human activities. Dissolved oxygen is necessary in aquatic systems for the survival and growth of many aquatic organisms and is used as an indicator of the health of surface-water bodies. This section of the National Field Manual (NFM) includes U.S. Geological Survey (USGS) guidance and protocols for four methods to determine dissolved-oxygen concentrations: the amperometric, luminescence (optical), spectrophotometric, and iodometric (Winkler) methods.

Contents

Acknowledgment

6.2 Dissolved Oxygen

6.2.1 Optical (Luminescence) and Amperometric Sensor Methods

6.2.1.A Equipment and Field Preparations

Equipment Description and Maintenance

Field trip preparations

6.2.1.B Calibration of Optical and Amperometric Sensors

Correction for Atmospheric Pressure and Salinity

Selection of Calibration Method

Optical (Luminescence) DO Sensors: Calibration Procedures

Amperometric (Clark cell) DO Sensors: Calibration Procedures

6.2.1.C Measurement

Surface water

Ground water

6.2.1.D Troubleshooting for Amperometric Instruments

6.2.2 Spectrophotometric (Rhodazine-D and Indigo-Carmine) Methods

6.2.2.A Equipment and Supplies

6.2.2.B Calibration and Interferences

6.2.2.C Measurement

6.2.3 Iodometric (Winkler) Method

6.2.3.A Equipment and Supplies

6.2.3.B Measurement

6.2.4 Reporting

6.2.5 Correction Factors for Oxygen Solubility Concentrations and Salinity

Selected References

 [Back] Return to Chapter A6 Contents Page

 [Back] Return to Field Manual Table of Contents

Section 6.2 Archived Versions:

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Page Last Modified: Thursday, 12-Sep-2013 14:01:08 EDT