The Winkler method now exists in seven modified versions which are still used today 27. While this method was considered the most accurate and precise for many years, it is also subject to human error and is more difficult to execute than the other methods, particularly in the field 27. The traditional method is the Winkler titration. These methods are quick and inexpensive for basic projects, but limited in scope and subject to error due to other redoxing agents that may be present in the water 27. There are two methods designed for high-range and low-range dissolved oxygen concentrations. The colorimetric method offers a basic approximation of dissolved oxygen concentrations in a sample. The dissolved oxygen sensor is attached to a meter for spot sampling and laboratory applications or to a data logger, process monitor or transmitter for deployed measurements and process control. Modern techniques involve either an electrochemical or optical sensor. There are three methods available for measuring dissolved oxygen concentrations. Dissolved Oxygen Measurement Methods Dissolved oxygen can be measured by colorimetry, a sensor and meter or by titration.
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