Determination of diethofencarb (isopropyl 3,4-diethoxyphenylcarbamate) by square wave voltammetry using a multiwall carbon nanotube paste electrode

Abstract

Diethofencarb fungicide has been studied by square wave voltammetry (SWV) on multi wall carbon nanotube paste electrode (MWCNTPE). The peak potentials have been shifted to more negative direction with increasing pH, showıng us a maximum peak response at + 861 mV (vs.Ag/AgCl) and pH 2.0. Operational parameters affecting sensitivity and selectivity such as accumulation potential (E acc ), accumulation time (t acc ), frequency (f) and pulse amplitude have been optimized. The constructed calibration curve was linear within the concentration range of 2.50 µg mL -1 and 30.5µg mL -1 . The calculated limit of detection (LOD) and limit of quantification (LOQ) values were 0.77µg/mL and 2.57µg/mL, respectively. Its determination were realized in the presence various fungicides to put forth the selectivity, accuracy and applicability of the recommended method. The spiked tomato juice samples with 2.50 -7.50 µg mL -1 diethofencarb were subjected to the proposed method and recoveries over 97% and relative standard deviations less than 3.8% reflected a high degree of accuracy and precision.

Voltammetric determination of phenmedipham herbicide using a multiwalled carbon nanotube paste electrode

“…To prepare MWCNTPEs, the multiwalled carbon nanotube powder (MER Corporation, mesh size <53 µ m) was mixed with water-immiscible mineral oil at a mass ratio of 70% and 30%, respectively. 42 This mixture, made homogeneous in a mortar, was plugged into the hollow part of the BAS MF 2010 electrode attached to the BAS C3 stand, then polished with a polishing cloth. It was then washed with distilled water and dried.…”