Absorption and Metabolism of Fipronil in Sugarcane and its Persistence in Soil
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Date
2012
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Abstract
The persistence and metabolism of fipronil in sugarcane leaves and soil were studied
following application of fipronil @ 75 and 300 g a.i. ha-1. Samples of sugarcane leaves and soil
were collected at various time intervals and analysed by using Gas Liquid Chromatograph (GLC)
and confirmed by Gas Liquid Chromatograph –Mass Spectrometry (GC-MS). The total residues
of fipronil and its metabolites in sugarcane leaves after 7 days of its application @ 75 and 300 g
a.i. ha-1 were found to be 0.26 and 0.66 mg kg-1, respectively.These residues could not be detected
after 60 and 90 days following the application of fipronil at lower and higher dosages,
respectively. The samples of sugarcane juice did not reveal the presence of fipronil residues at
harvest. Maximum residues of fipronil and its metabolites in soil samples were found to be 0.025
and 0.098 mg kg-1 collected 7 days after the application of fipronil @ 75 and 300 g a.i. ha-1,
respectively. These residues could not be detected after 210 and 240 days following the
application of fipronil at lower and higher dosages, respectively. In laboratory experiment, the
residues of total fipronil in sandy loam, loam and clay loam after 7 day of its application @ 100
mg kg-1 were found to be 74.30, 75.80 and 82.50 mg kg-1, respectively. The persistence of fipronil
was found to be almost equal in all types of soil. Three soil microbes viz. Bacillus firmus,
Bacillus aerophilus and Bacillus thuringiensis were isolated and identified from sugarcane fields.
These were found to be very effective in degradation of fipronil.
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