Fig. 2.

Generation of ClO₂ gas in a 14-l chamber. ClO₂ gas was generated by mixing 3.35% sodium chlorite solution and 85% phosphoric acid. (A) Gas generation at three different volume ratios. The mixtures at 2:1, 10:1 and 50:1 volume ratios were prepared by mixing 4 ml/m³(actual amount: 56 µl) of sodium chlorite solution and phosphoric acid (actual amounts were 28, 5.6 and 1.1 µl, respectively). (B) The dependency of gas concentrations on sodium chlorite solution volume. Sodium chlorite solution and phosphoric acid were mixed at a 10:1 ratio, and the mixture was used at various volumes of sodium chlorite ranged from 0.5 ml/m³ to 4.0 ml/m³(actual amounts: 7.0 µl to 56 µl). Three independent experiments were performed, and data represent mean ± SD (n=3).