water is depicted in Table 3. Schoning and Schmuck
(2003) has reported a gradient HPLC – tandem MS method
for imidacloprid recovery. The repeatability of the method
was determined for the analyte by running a set of five
recoveries each at two different fortification levels for
selected matrices. The resulting mean recovery rates ranged
from 79% to104% with relative standard deviations
between 0.8% and 15.3%. Similar results were found in
present method validation for different soil and waters. The
repeatability of the method in the present study was
determined for each fortification levels by running a set of
five recoveries each different fortification levels for selected
matrices. The % RSD was the resulting mean recovery
rates ranged from 94.66% to 95.27% in soil with relative
standard deviations between 1.21% and 3.37%. The %
RSD was the resulting mean recovery rates ranged from
92.34% to 96.86% in water with relative standard deviations
between 1.66 and 3.23%. These data demonstrate the
excellent sensitivity, selectivity and precision of the
method (Table 3).
We have developed and validated a rapid, simple, sensitive
and specific method for the determination of imdacloprid
residues in/on different soil viz. sandy loam, clay,
red and black soil and waters viz. pH4, 7 and 9 through
HPLC. A simple clean-up procedure using column chromatography
was found to yield sufficiently clean samples.