純水に対する溶存酸素濃度の測定

主として溶解度について

抄録

This report describes the experimental procedure and the measurement of oxygen solubility (dissolved oxygen concentration with air) in pure water, which is used for the calibration of dissolved oxygen meters. The solubility in the region of 0-40°C C was measured by means of modified Winkler titrimetric technique in which the iodine volatilization was controlled.
Experimental result showed that the solubility c₅ (mg/l) at temperature t (°C) was expressed with following polynominal equation and its accuracy was better than ±0.4 %.
c₅ = 14.536- 0.4049t+ 8.520×10^-3t²-1.123×10^-4t³ + 6.34×10^-7t⁴.
The influences, of the iodine volatilization, the atmospheric pressure, and dissolved oxygen in reagents on the measured value were discussed and the result was compared with the previous works.