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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)

6.4 pH, Version 2.0 dated 10/2008

Revised By G.F. Ritz and J.A. Collins

This section of Chapter 6 is available as a pdf file:
6.4, Version 2.0 (dated 10/2008) [195KB PDF]

Download a copy of Adobe Acrobat Reader for free.

Abstract

Measurement of pH is critical to the understanding of the viability and vulnerability of environmental waters and is considered a master variable in determining the aqueous geochemistry of an aqueous system. pH is a measure that represents the hydrogen-ion concentration (activity) of a solution. This section of the National Field Manual (NFM) describes U.S. Geological Survey (USGS) guidance and protocols for measurement of pH in ground and surface waters.

Contents

6.4 - pH

6.4.1 Equipment and supplies

6.4.2 Maintenance of pH instruments

6.4.3 Calibration of the pH instrument system

6.4.4 Measurement

6.4.5 Troubleshooting

6.4.6 Reporting

6.4.7 Selected References

6.4.8 Acknowledgments

 [Back] Return to Chapter A6 Contents Page

 [Back] Return to Field Manual Table of Contents

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Page Last Modified: Wednesday, 21-Aug-2013 16:53:57 EDT