Registration Dossier
Registration Dossier
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EC number: 200-663-8 | CAS number: 67-66-3
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
Available studies on the phototransformation of chloroform are not guideline-compliant. The available data indicate a rather slow dissipation of chloroform in air with an average half-life of approximately 70 days. The presence of smog may accelerate dissipation.
Key value for chemical safety assessment
- Half-life in air:
- 70 d
Additional information
The studies of Pearson et al. (1975) and Singh et al. (1981) indicate rather long half-lives for photodegradation of chloroform in air of around 120 days. The half-life calculated by Singh et al. (1981) is for the reaction of chloroform with OH-radical being present in the atmosphere at a concentration of 1000,000 molecules per cm3. Klöpffer et al. (1988) studied the rate constant for reaction of chloroform with OH-radical in a standardised system by using a smog chamber equipped with 65 W Hg low pressure lamps. The reaction of atmospheric contaminants with OH-radical was described as the most important removal process from the atmosphere in their work. The concentration of OH-radical in the test atmosphere was considerably higher than the one assumed by Singh et al. (1981). Consequently, Klöpffer et al. (1988) found a higher rate constant for reaction of chloroform with OH-radical resulting in an estimated half-life for atmospheric chloroform of 26 days.
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