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Its concentration of dissolved oxygen is an important consideration for water used in both biological and industrial processes. Not only is it necessary to know the exact concentration at intervals but in many processes it is necessary to guard against momentary or periodic variations in the concentration. This symposium presents the best current information on methods and apparatus for determining dissolved oxygen in water including both the manual spot-check methods and those using instruments providing continuous indication and record. The authors discuss the principal advantages and disadvantages of their respective procedures and apparatus, indicating the conditions under which each can be applied most appropriately. The Stoffer paper provides a permanent record of the results of the latest in a series of clinics on determination of dissolved oxygen which have been conducted by ASTM Committee D-19 on Industrial Water. It is disappointing that the results should be inconclusive after such a considerable expenditure of time, money, and talent. The shortcomings of design or performance of the comparative tests have been recognized by the Committee, or have been brought to its attention. The objective of true calibration of the several competing methods will continue to be pursued. Eckenfelder and Burris discuss the principle and application of the polarographic method to dissolved-oxygen determination including some interesting and useful sidelights on the historical and mathematical background.