|Statement||by Anise Ahmed and Jessica Archer.|
|Series||Publication -- no. 04-03-039, Publication (Washington (State). Dept. of Ecology) -- no. 04-03-039.|
|Contributions||Archer, Jessica., Washington (State). Dept. of Ecology.|
|The Physical Object|
|Pagination||iv, 17 p. :|
|Number of Pages||17|
The USGS has been measuring water for decades. Some measurements, such as temperature, pH, and specific conductance are taken almost every time water is sampled and investigated, no matter where in the U.S. the water is being studied. Another common measurement often taken is dissolved oxygen (DO), which is a measure of how much oxygen is dissolved in the . Previous to this study, there had been a lack of data on dissolved oxygen in Oakland Bay in Mason County, particularly in the upper region of the bay. A study was undertaken in September to measure vertical dissolved oxygen profiles at several locations within the bay. The vertical profiles were measured using a Seabird™ CTD instrument. The concentration of dissolved oxygen in water depends also on temperature, pressure, and concentrations of various ions [cf., Hutchinson (), Wetzel ()]. To be successful, a method for measuring dissolved oxygen must meet two requirements. Measurement of Dissolved Oxygen by Michael L. Hitchman (Author) › Visit Amazon's Michael L. Hitchman Page. Find all the books, read about the author, and more. See search results for this author. Are you an author? Learn about Author Central. Michael L. Hitchman (Author) Reviews: 1.
Dissolved Oxygen Measurement One of the most important measurements in the determination of the health of a body of water is its dissolved oxygen content. The quantity of dissolved oxygen in water is normally expressed in parts per million (ppm) by weight and is due to the solubility of oxygen from the atmosphere around us. How dissolved oxygen enters water. Dissolved oxygen enters water through the air or as a plant byproduct. From the air, oxygen can slowly diffuse across the water’s surface from the surrounding atmosphere, or be mixed in quickly through aeration, whether natural or man-made aeration of water can be caused by wind (creating waves), rapids, waterfalls, ground water discharge or other. This technology became, and still is, the trusted global standard for dissolved oxygen measurement. In , YSI released the patented Rapid Pulse® stirring-independent oxygen sensor which revolutionized the measurement of dissolved oxygen in long-term monitoring applications. There are a number of ways to measure dissolved oxygen concentration. Select a method based on 1) the number of ponds or tanks to be measured, 2) the level of accuracy required, and 3) the cost of the measurement technique. The titration-based drop count method fairly rapidly assesses whether or not there is sufficient dissolved oxygen in water.
However, even at the warmest temperatures seen in the Bay (around 91 degrees Fahrenheit), water is capable of having dissolved oxygen concentrations of 6 to 7 mg/L. So, although high temperatures can influence dissolved oxygen levels, temperature is not the only cause of low-oxygen areas found in the Bay each summer. Nutrient pollution. The Marine Water Condition Index measures changes in water quality against a baseline reference period (). The index integrates 12 variables that each describe an important aspect of water quality, such as temperature, salinity, nutrient balance, algae biomass, and dissolved oxygen, to monitor improvements or declines in Puget Sound marine water quality. provides a measure of the redox potential of the water column. The concentration of dissolved oxygen can be readily, and accurately, measured by the method originally developed by Winkler in (Ber. Deutsch Chem. Gos., 21, ). Dissolved oxygen can also be determined with precision using oxygen . oxygen than others, in some parts of the Bay dissolved oxygen can fall to the point where no animals can survive. When the levels drop below mg l-1, the water is hypoxic, and when it drops below mg l-1 the water is considered anoxic (Figure 1). In an estuary such as Chesapeake Bay, there are several.