常用器具による瓶内滴定Winkler法(O2)

概要

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A modification of Carpenters method for oxygen analysis has been described. It requires only conventional equipment, such as oxygen sampling bottles, dispensers, and a burette. How-ever, the standard deviation can be about 1-10μl O2/l when using a starch indicator and 100ml-sized sampling bottles. To obtain better precision or accuracy, the present method involves the removal of deoxygenated supernatant to make space for titration in the bottle, a clarifier for the supernatant, and a sulfate buffer to keep the titration medium in proper pH condition in spite of the difference in volume removed or remaining. The oxygen in the reagents for fixation was found to be 1.592ml O2/l, while the correction for reagents is also described.
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