Fig. 3.
Generation of ClO2 gas in a test room (87 m3). Under high-humidity (75% to 85% relative humidity), ClO2 gas was generated by mixing 3.35% sodium chlorite solution and 85% phosphoric acid at a 10:1 ratio. (A) Distribution of ClO2 gas in the test room. The mixture of sodium chlorite solution (4.0 ml/m3) and phosphoric acid was as follows: actual amounts were 348 ml and 34.8 ml, respectively. ClO2 gas concentrations were measured at both 0.1 m and 2.5 m from the floor. (B) Time course of changes in ClO2 gas concentrations. Experiments were carried out using various amounts of sodium chlorite solution ranged from 0.25 ml/m3 to 20.0 ml/m3 (actual amounts: 21.8 ml to 1,740 ml). Three independent experiments were performed, and data represent mean ± SD (n=3) except 20 ml/m3 (n=2).