Abstract
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.
