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EC number: 205-087-0
CAS number: 133-06-2
Captan was used in a soil
metabolism study under anaerobic conditions. Sampling times were at 0, 6
and 24 hours and 3, 7, 14, 30 and 90 days after initiation of anaerobic
Captan was readily degraded
into various metabolites under anaerobic conditions. One
of the major degradates was14CO2 (35% after 3
days; all of the radioactivity after 14 days). The other major
metabolite, thiocarbonic acid was also formed rapidly and was aqueous
extractable. The highest amount of thiocarbonic acid was 6.32% under
The14C bound to
soil averaged 21.4% in the study.
Captan was rapidly degraded
in the soil under anaerobic conditions. Its experimentally observed
half-life was approximately 0.91 d.
Anaerobic metabolism of [trichloromethyl - 14C] captan in soil, 25°C ± 2°C, sandy loam in the dark, incubation 90 days: DT50 = 0.91 days, USEPA 162-2.
Soil degradation of captan
is very rapid under both aerobic and anaerobic conditions, with a DT50
of less than 1 day. Both the tetrahydrophthalimid ring and the
trichloromethyl sidechain moieties of captan are mineralised to carbon
dioxide. The principal initial degradate is THPI which undergoes
cleavage of the imide ring to give THPAM. Other metabolites are
generally at levels below 5% of the applied dose, apart from THCY (max.
20%) which is an important degradate under anaerobic conditions,
although these conditions would not normally be encountered during the
use of captan. THCY
has been demonstrated to rapidly degrade to THPAM under aerobic
conditions. THPAM is further degraded to CO2, which is incorporated into
natural constituents of the soil.
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