Monitoring the quality of rivers and lakes is becoming more and more important as enviornmental concerns increase. A good dissolved oxygen transmitter
used properly is one of the important tools to use in this regard. You may want to look at http://www.ecy.wa.gov/programs/wq/plants/management/joysmanual/4oxygen.html for some useful techniques.
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Arch Hyg Bakteriol
Rev Sanid Milit Argent
Trans Kans Acad Sci