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EC number: 204-424-9
CAS number: 120-78-5
The UV absorption spectrum of Thiofide shows that it absorbs strongly
into the solar spectral region. The measurements for the sunlight
photolysis of a 0.9-ppm sample presented a photolysis rate constant of
6.2*10-5 /sec. The determined half-life of Thiofide was 3
hours at midday. In the dark control a half-life of approximately 19
hours was obtained at 24°C.
In addition to the major peak, three front-eluting peaks were present in
the test solution before photolysis began. As photolysis proceeded, the
area of the front three peaks increased. No other photolysis products
were detected by HPLC. The HPLC traces for the dark control are similar
to those obtained during the sunlight photolysis experiment.
The screening experiment for the sunlight direct photolysis of MBTS in
pure water gave a first-order rate constant of 6.2*10-5sec-1at
midday in August, which corresponds to a half-life of 3 hours (Monsanto,
1980). In both the photolysis experiment and the dark control, three
transformation products were detected by HPLC but not identified
The screening experiment for the sunlight direct photolysis of MBTS in pure water gave a first-order rate constant of 6.2*10-5sec-1at midday in August, which corresponds to a half-life of 3 hours (Monsanto, 1980). In both the photolysis experiment and the dark control, three transformation products were detected by HPLC but not identified (Monsanto, 1980).
The value mentioned above refers to the top millimetres of a water body
in summer, because of factors like cloudiness, shadowing effects of
vegetation, absorption and scattering of light by suspended solids etc.
the actual environmental lifetime is substantially higher.
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