Devoloping a method for the determination of alanycarb insecticide by differential pulse polarography

As basis for the development of a sensitive analytical method for the determination of the insecticide alanycarb, a study of the differential pulse polarographic (DPP) reduction of alanycarb [(ethyl(Z)?N?benzyl?N-[[methyl(1-methyl thioethylideneaminooxycarbonyl) amino] thio ]?ß?alaninate)] on a dropping mercury electrode (DME) was performed. The insecticide was found to give a single DP peak over the pH range 1,0 to 6,0 and the pH dependency of the peak potential showed a linear segment with a slope of 65,2 mV/pH. For the analytical DPP method running at pH 6,0 (peak at ?503,6 mV), the relationship between the peak current and alanycarb concentration was linear in the range of 1,10 to 9,76 mg mL? 1 with a detection limit of 0,33 mg mL-1. The proposed method was applied for the determination of alanycarb in spiked dam water and orange juice samples. The recoveries calculated for both types of dam water and orange juice samples spiked with 12,0 mg mL-1 alanycarb were 96,7 and 99,2 % with relative standard deviations of 5,2 and 1,7%, respectively. The sufficiently good recoveries and low relative standard deviations for the data reflect the high accuracy and precision of the proposed differential pulse polarographic method. The effects of diverse metal ions and other commonly used pesticides on the determination of alanycarb were also investigated.