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EC number: 233-162-8
CAS number: 10049-04-4
As demonstrated by different studies in this
section, chlorine dioxide reacts with a number of inorganic and organic
substances like iron, sulphuric compounds (organic as well as
inorganic), phenolic compounds and humus acids. Surface waters, ground
water, waste water etc. are unique in terms of their composition and
therefore the combination of substances that can react with and degrade
chlorine dioxide. The laboratory study has consequently to be seen as an
example of how chlorine dioxide may decay in the aqueous environment.
Studies from Ottaviani et al. (2002)
and Belluati (2007) demonstrated that Chlorine dioxide is completely
degradated within 37 and 18 min respectively.
No decay of ClO2 could be detected
using tap water during the evaluated time frame. The reason for the slow
decay in tap water is the low amount of substances that can be oxidized.
Still a low amount of ClO2 in the water leaving the water
treatment plant is desired in order to prevent recontamination of the
water and to avoid bio-fouling of the water pipes. The study from Van
der Togt and van Ginkel (2005), on chlorate degradation, concluded that
while chlorate is degradated to chloride, no chlorite is observed. Thus,
chlorite is completely degradated within few minutes.
Chlorine dioxide is completely degradated within seconds to
minutes under the conditions of use. It is considered that no chlorine
dioxide reaches the environment. Chlorine dioxide is entirely degraded
to chloride and chlorate ions, via the transient intermediate of
chlorite which has a really short half-life (few seconds).
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