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A new simple spectrophotometric method has been developed for the determination of metribuzin herbicide in formulations and potato samples. The method is based on the reaction of p-dimethylamino-benzaldehyde (DMAB) with sodium hydroxide via Cannizzaro’s reaction at 100 °C to form a p-dimethylaminobenzoic acid. The resultant p-dimethylaminobenzoic acid reacted with metribuzin herbicide in acidic media at 100 °C and the yellow colored product was measured at 455 nm. The reaction conditions and other analytical parameters were studied and optimized. A linear plot between absorbance and concentration over the range from 0.2 to 20 μg mL−1 was found with molar absorptivity of 2.1 × 104 L mol−1 cm−1. The limit of detection (LOD) and limit of quantification (LOQ) were found to be 0.05 and 0.2 μg mL−1, respectively. The proposed method has been successfully applied for the analysis of commercial formulation and potato sample. The recoveries of the method were found to be in the range from 92.16 ± 0.06% to 96.66 ± 0.18%.Two level factorial designs of 23 and 22 were used to optimize all parameters, determine the influence of different parameters and their interactions on the final product formation

journal of saudi chemical society

Spectrophotometric determination of metribuzin herbicide with p -dimethylamino-benzaldehyde using factorial designs for optimization of experimental variables