The monitoring of 19 pesticides in drainage and groundwater
at a golf course was performed when there was no
runoff water. The loading rates of most pesticides
via
leaching water were lower than 4% of application amount,
except for more than 23% for terbutol. The times of
pesticides loading into the drainage reducing to 50% of
initial [t
1
/2(loading)]
were 40.3 months for terbutol, 9.4 months
for isoprothiolane, 6.6 months for flutolanil, and within
1
month for the other pesticides. On the basis of
several
published models for predicting pesticides leaching to
groundwater at agricultural land, the pesticides having
the
GUS score greater than 0.4 or exhibiting K
oc
less than
7000 cm3 g-1, and
t
1
/2(soil) greater than 3
days were classified
as the pesticides leaching to groundwater at golf courses.
The golf course is a high pollution potential area
compared with agricultural land. For the persistence
of
terbutol at golf courses, the concentrations of terbutol
in subsoils at the depth greater than 50 cm were higher
than the other pesticides after 4 years when terbutol
was applied. The half-life
[t
1
/2(soil)] of terbutol,
isoprothiolane,
and fltutoranil in the turf grass soils under an aerobic
condition was 200, 180, and 360 days, respectively.
Organic
carbon partition coefficient (K
oc) and relative
mobility in
the soil column of terbutol were the same as
isoprothiolane
and flutoranil. These results suggested that
persistence
of terbutol was mainly caused by slow degradation rate in
the subsoils.
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