Published or not - fyto

CHLOROTHALONIL
- 19 -
APPENDIX II
END POINTS AND RELATED INFORMATION
2. Fate and behaviour in the environment
20 December 2004
2.2 Fate and behaviour in water
Abiotic degradation
Hydrolytic degradation:
Major metabolites:
Photolytic degradation:
Major metabolites:
pH 5: no hydrolysis (n=3)
pH 7: no hydrolysis (n=3)
pH 9: DT50 (20°C) 16-38 days. (n=
none
Photolysis of chlorothalonil is not
an important route in the
environment.
DT50 65 days, non-validated
method
DT50 10.5 h, with acetonitrile
acting as photosensitiser
SDS-3701: DT50 47.5 min at
40°C and 53.7 min at 18°C
Biological degradation
Readily biodegradable:
Water/sediment study:
DT 50 water:
DT 90 water:
DT 50 whole system:
DT 90 whole system:
Distribution in water / sediment
systems
(active substance)
Distribution in water / sediment
systems
(metabolites)
no
2.5 hours; This value also applies
for the whole system (study 7)
major part of r.a. in water phase.
Max. in water: 72% at 0 day. Max
in sediment: 4.7% at 0,25 day and
after day 14 remains 10% of
applied radioactivity. In the
sediment bound residues