A novel spectrophotometric method for the determination of Carbaryl in Environmental samples

A novel, rapid, robustic and sensitive spectrophotometric method was developed for the determination of carbaryl in its formulations, water and grain (rice and wheat) samples with newly synthesised reagent. The proposed method was based on the alkaline hydrolysis of carbaryl pesticide and thus resulted 1-naphthol was coupled with diazotised 4-bromoaniline to give dark pink colored product having λ_max 518 nm for diazonium method (DM). The formation of colored derivatives with the coupling agent is instantaneous and stable for 48 h (DM). Beer's law was obeyed in the concentration range of 0.5–10.0 μg·mL⁻¹ for DM .Molar absorptivity and Sandell’s sensitivity were found to be 6.596 x 10⁴ l mol^-1cm^-1 and 0.0305 μg cm^-2 respectively. The experimental results indicate that the procedure can eliminate the fundamental interferences caused by other pesticides and non-target ions, which made the methods more sensitive and selective. The method was applicable to the determination of carbaryl residue in water and food grain samples up to μg level.

Author(s): Potla Krishna Murthy, Munga Sulochana, Nuthalapati Venkatasubba Naidu

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