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Degradation of chlorpyrifos residues in apple under temperate conditions of Kashmir Valley
Ist Teil von
Environmental monitoring and assessment, 2015-08, Vol.187 (8), p.482-482, Article 482
Ort / Verlag
Cham: Springer International Publishing
Erscheinungsjahr
2015
Link zum Volltext
Quelle
SpringerLink (Online service)
Beschreibungen/Notizen
The present studies were carried out to observe the dissipation pattern of chlorpyrifos on apple in Kashmir Valley. Persistence of chlorpyrifos in apple was studied following two applications rates of chlorpyrifos (Dursban 20 EC) at 200 g a.i. ha
−1
(single dose
T
1
) and 400 g a.i. ha
−1
(double dose
T
2
). The average initial deposit of chlorpyrifos was found to be 1.61 and 1.98 μg g
−1
for
T
1
and
T
2
application rates respectively on apple. The residues dissipated to 0.09 and 0.06 μg g
−1
after 15- and 30-day post treatment with half-life periods of 3.34 and 5.47 days in
T
1
and
T
2
application rates, respectively. The residues of chlorpyrifos dissipated to below limit of quantification (LOQ) of 0.04 μg g
−1
after 30 day at
T
1
application rate. A waiting period of 6 days must be observed for chlorpyrifos on apple at recommended application rate for the safety of consumers. Theoretical maximum residue contribution (TMRC) values were found to be far less than maximum permissible intake (MPI) at 0 day in both the dosages suggesting chlorpyrifos on apple in Kashmir is unlikely to cause health risks.