Abstract
Four different methods for the determination of the dissolved oxygen in the water-WINKLER's iodometric method, MILLER-SIBATA's ferrous method, WINKLER-SUGAWARA's carbon dioxide method, and VAN SLYKE's manometric method-were compared. The dissolved oxygen content in the water which is abundant in micro-phytoplankton is undervalued by WINKLER's method owing to adsorption of iodine to the plankton, and is overvalued by MILLER-SIBATA's owing to indistinctiveness of the end-point of the titration. Both the accuracy and precision in MILLER-SIBATA's decrease accordingly as the salinity of the water increases, because certain cations in it may be partly precipitated by the hydroxide ion in the reagent. WINKLER-SUGAWARA's and VAN SLYKE's methods are generally accurate, and the former is good in the precision as well as in the accuracy.
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