Abstract
Abstract An automatic recording analyzer for the determination of dissolved oxygen (in concentrations up to 50 p.p.b.) in boiler feed water by Winkler’s method has been described. The instrument is so designed as to perform automatically most of the operations involved in manual analysis, such as sampling, the addition of reagents, titration, recording, and cleansing. The series of required operations (all of the operations in both sample and blank analyses) is completed in 30min. and is automatically repeated. A more important feature of the instrument is that hydrazin-treated feed water, as well as feed water not treated with hydrazin, can be analyzed with accuracy. The oxygen content, however, cannot be read directly on the recorder chart and must be calculated from the recorded quantities of the titrant used. The precision of oxygen determination is within 2 p.p.b. The reproducibility is better than that of manual analysis.
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