Persistence of fipronil and its metabolites in chilli and soil
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Date
2012
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
CCSHAU
Abstract
A f ield exper iment was carried to study the persiste nce behavior of chilli and soil underneath
and ef fect of processing on the reduction of residues of f ipronil in chilli. Degradation of f ipronil in soil
under laboratory and f ield conditions was also studied. Fipronil (Comme rcial formulation) @ 50g and
100g a.i.ha
-1
was spray ed in the vegetable Research Farm of Chaudhary Charan Singh (CCS) Hary ana
Agricultural University , Hisar on chilli c rop (var iety Hisar Shakti) at f ruiting s tage. Samples of chilli
and soil were collected per iodically on 0(1h) , 1, 3, 5, 10, 15, 20 and 30 day s af ter application and
harvest. Red chilli collected at harvest (90 day s) contained no detectable residues of f ipronil. Soil
samples ( lab and f ield conditio ns) were collected per iodically on 0(1h) , 1, 3, 7, 15, 30, 60, 90 day s af ter
application. Residues were estimated by gas chromatography equipped with capillary column and
electron capture detector (ECD) . Pe rcent recover y at for tif icatio n level of 0.05and 0.10 mg kg
-1
in c hilli
and soil were more 80 percent depicting validity of methods used for present studies. The residues of
f ipronil did not pe rsist for more than 15 day s af ter treatment. Dissipation followed the f irst o rde r
kinetics showing half -life value of 3.19 and 3.67 day s for single and double dose, respectivel y . The per
cent reduction of f ipro nil residues by washing was 21.05 ñ 61.72 and 23.52 ñ 62.04 at single and
double dose, respectivel y . Maximum reduction was observed on 3
rd
day . In soil unde r f ield and
laborato ry conditions f ipronil pe rsisted up to 90 and 120 days, respectivel y . Dissipatio n followed f irst
order kinetics with half -life per iod of 10.81ñ9.97 day s and 13.14ñ12.22 day s in f ield and lab
conditio ns. Persis tence of f ipronil in soil was found to be more under laborato ry conditions as
compared and f ield conditio ns.
Description
Keywords
Persistence, Fipronil, Soil, Chilli, Half ñlife period