A kinetic spectrophotometric method for determining the residues of herbicide
bromofenoxim (BrFX) has been developed and validated. The proposed method is
based on the inhibitory effect of BrFX on the oxidation of sulfanilic acid
(SA) by hydrogen peroxide in the presence of Cu(II) ion, which was monitored
at 370 nm. The variables affecting the rate of the reaction were investigated
and the optimum conditions were established. BrFX can be measured in the
range of 0.041 - 0.46 ?g/ml and 0.46 - 13.86 ?g/ml. The detection limit of
the method with 3? criteria is 0.0077 ?g/ml. The relative standard deviations
for five replicate determinations of 0.041, 0.24 and 0.46 ?g/ml BrFX are 3.0,
5.32 and 2.85%, respectively. This method can be successfully used to
determine BrFX concentration in baby juice samples. The HPLC method is used
to verify the results. The results obtained for the same samples by the two
methods are quite comparable. [Projekat Ministarstva nauke Republike Srbije,
br. 172061]
A kinetic spectrophotometric method for measuring 2,4-dichlorphenoxyacetic acid (2,4-D) is described in this study. The proposed method is based on the inhibitory effect of 2,4-D on the oxidation of sulfanilic acid by hydrogen peroxide in the presence of Co(II) ion, which was monitored at 370 nm. The variables affecting the rate of the reaction were investigated and the optimum conditions were established. 2,4-D can be measured in the range of 0.07 -2.35 μg mL -1 and from 2.35 to 23.50 μg mL -1 with the detection limit of 0.004 μg mL -1 . This method was used to determined traces of 2,4-D in baby fruit juices. The HPLC method was used like a comparative method to verify the results. The results obtained by the proposed method were compared with those obtained by HPLC using UV -DAD detection and they showed a good agreement.
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