Abstract − Analytical Sciences, 22(1), 145 (2006).
Determination of Starane (Fluroxypyr) Herbicide Using Flow Injection Spectrophotometry
Jasmin SHAH, M. Rasul JAN, and Nadia BASHIR
Department of Chemistry, University of Peshawar, N. W. F. P., Pakistan
The starane herbicide was spectrophotometrically determined by the diazotization method in a flow injection assembly. Since starane is a substituted pyridyl compound the NH2 group at the p-position was exploited for diazotization. Starane was diazotized with nitrite and the diazotized product is coupled with β-naphthol. The absorbance of the resulting azo dye was measured at 395 nm with a molar absorptivity of 1.5 × 104 L mol-1 cm-1. The calibration graph was linear over the range of 0.6 to 10 µg/mL, with a relative standard deviation (RSD) of 1.67% and a sampling through put of 60 samples h-1. The % recovery for the determination of starane was found to be 96%. The method was successfully applied to the determination of the active ingredient of starane herbicide in its formulation as well as in food samples.
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