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ABOUT THE WYOMING-MONTANA WATER SCIENCE CENTER

USGS IN YOUR STATE

USGS Water Science Centers are located in each state.

There is a USGS Water Science Center office in each State. Washington Oregon California Idaho Nevada Montana Wyoming Utah Colorado Arizona New Mexico North Dakota South Dakota Nebraska Kansas Oklahoma Texas Minnesota Iowa Missouri Arkansas Louisiana Wisconsin Illinois Mississippi Michigan Indiana Ohio Kentucky Tennessee Alabama Pennsylvania West Virginia Georgia Florida Caribbean Alaska Hawaii New York Vermont New Hampshire Maine Massachusettes South Carolina North Carolina Rhode Island Virginia Connecticut New Jersey Maryland-Delaware-D.C.

Tongue River Surface-Water-Quality Monitoring Network

Project Chief: Jill Frankforter
Period of Project: January 2004 - Present
Cooperators: Bureau of Land Management bulletFidelity Exploration and Production Co bulletMT Dept of Natural Resources & Conservation bulletNorthern Cheyenne Tribe bulletWY State Engineer bulletMT Dept of Environmental Quality bulletWY Dept of Environmental Quality

Update on Field Sodium Adsorption Ratio (SAR) Analyzer

January 2005

The field SAR analyzer is a instrument designed for long-term deployment in streams or other water bodies. The instrument periodically performs sequential analyses to determine sodium, magnesium, and calcium concentrations.  These concentrations are used to calculate the SAR.  The concentration and SAR data can be transmitted in real time by satellite for display on the USGS Tongue River Surface-Water-Quality Monitoring Network website.  The frequency of measurements is adjustable, with hourly measurements being a good compromise between very frequent measurements that could quickly exhaust analytical reagents in the analyzer and infrequent measurements that may not adequately characterize SAR fluctuations in the river.

Several analytical methods were considered during development of the instrument, and two methods were finally chosen.  An ion selective micro-electrode is used to determine sodium, and spectrophotometric methods are used to determine magnesium and calcium.  Photographs of the instrument are shown below.

The SAR analyzer was field tested for the first time during September 2004 at Tongue River at State Line (06036300).  This initial deployment was generally successful.  Mechanically, the instrument performed well, but further refinement of the analytical methods and resolution of data logging and transmission issues will be necessary to ensure reliable results.  We will continue to refine the analytical techniques and resolve the data logging and transmission issues during the winter.  We expect to have a fully functional field SAR analyzer installed at the State Line site by the end of spring 2005.

Previous plan for field SAR analyzer -- January 2004

Photograph of the pumping, control, and analytical equipment

Figure 1. Photograph of the pumping, control, and analytical equipment installed in the field SAR analyzer.

 

Photo of the micro sodium electrode and the micro reference electrode

Figure 2.  Photograph of the micro sodium electrode and the micro reference electrode used in the field SAR analyzer to measure sodium concentration.

 

 

      Photograph of the field SAR analyzer.

Figure 3.  Photograph of the field SAR analyzer.

 

 

Photograph showing watertight housing of field SAR analyzer.

Figure. 4. Photograph showing watertight housing of field SAR analyzer.  The electronics, pump, and valves are inside the housing.

 

 

Photograph of USGS gaging station at Tongue River at State Line

Figure 5. Photograph of USGS gaging station at Tongue River at State Line, where the field SAR analyzer will be installed in 2005.  The analyzer will be deployed in the 8-inch-diameter PVC pipe.

For more information, contact:
Thomas Chapin
U.S. Geological Survey
P.O. Box 25046, Mail Stop 973
Denver Federal Center
Denver, CO 80225
303-236-5795





 

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Page Last Modified: Tuesday, 13-Dec-2016 11:21:47 EST