The concentration of dissolved oxygen can be readily, and accurately, measured by the
method originally developed by Winkler in 1888 (Ber. Deutsch Chem. Gos., 21, 2843).
Dissolved oxygen can also be determined with precision using oxygen sensitive
electrodes; such electrodes require frequent standardization with waters containing
known concentrations of oxygen. They are particularly useful in polluted waters where
oxygen concentrations may be quite high. In addition, their sensitivity can be exploited
in environments with rapidly-changing oxygen concentrations. However, electrodes are
less reliable when oxygen concentrations are very low. For these reasons, the Winkler
titration is often employed for accurate determination of oxygen concentrations in
aqueous samples.
The concentration of dissolved oxygen can be readily, and accurately, measured by themethod originally developed by Winkler in 1888 (Ber. Deutsch Chem. Gos., 21, 2843).Dissolved oxygen can also be determined with precision using oxygen sensitiveelectrodes; such electrodes require frequent standardization with waters containingknown concentrations of oxygen. They are particularly useful in polluted waters whereoxygen concentrations may be quite high. In addition, their sensitivity can be exploitedin environments with rapidly-changing oxygen concentrations. However, electrodes areless reliable when oxygen concentrations are very low. For these reasons, the Winklertitration is often employed for accurate determination of oxygen concentrations inaqueous samples.
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