Disinfection chemicals - chlorine dioxide
Chlorine dioxide behaves totally different from chlorine in water. It is 10 times more soluble in water than chlorine (3.01 grams/liter at 25 degrees C) and it doesn't hydrolyze. It remains as a "true" dissolved gas that retains its useful oxidative and biocidal properties throughout the entire 2 to 10 pH range.
By way of contrast, chlorine dissociates when dissolved in water to form hypochlorous and hydrochloric acids.
Hypochlorous acid is the primary biocide in solution, which dissociates to form hypochlorite ion with increasing pH.
Hypochlorite ion is only from 1/20 to 1/300 as effective in controlling microbes as hypochlorous acid. Thus,
chlorine can only be an effective biocide in systems within a relative small pH-range ( 6 – 8 ).
The high degree of solubility exhibited by chlorine dioxide in water has also been observed in a variety of organic materials, such as oils and solvents,
thereby allowing for utilization of its unique oxidative and biocidal properties in a wide range of potential applications.