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Physical & Chemical properties

Water solubility

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Description of key information

Aqueous solution (as generated in-situ): solubility as a function of temperature and partial pressure (off-gassing).

Maximum 60 g/L but unstable. Typically, 3 g/L at 25°C and 4600 Pa.

Key value for chemical safety assessment

Additional information

Various results were found in the literature, and a single value cannot be determined, as solubility is highly dependent from temperature and partial pressure. Chlorine dioxide is a true gas dissolved in water, and can be easily stripped. Gall (1978) publication provides a table with curves for different temperatures, showing that solubility increases with decreasing temperature (for the same partial pressure), and with increasing partial pressure (for a given temperature). The Simpson's book provides similar curves, with indication of safe area.

The maximum solubility of chlorine dioxide reported in the literature is 60 g/L, but unstable as highly reactive liquid ClO2 begins to separate out. This concentration is far higher than the typical concentration generated on an industrial scale (normally up to 3 g/L). A typical concentration of 3 g/L at 25°C with partial pressure of 4600 Pa seems to be recognised as stable and safe.