A novel carbon paste electrode based on nitrogen-doped hydrothermal carbon for electrochemical determination of carbendazim

Abstract

In this work, a new carbon paste electrode, prepared from nitrogen- -doped hydrothermal carbon (CHTCN) was applied for the electrochemical detection and determination of carbendazim fungicide. CHTCN samples with the nominal nitrogen content 0.05?0.5 wt. % in glucose precursor were prepared by simple, low-cost synthesis with the accompanying carbonization to 1273 K. The presence of nitrogen in CHTCN samples was confirmed by elemental analysis. Characterization of CHTCN as material for carbon paste electrode was achieved by cyclic voltammetry measurement of the Fe(CN)6 3-/4- redox couple. The results showed that best electrochemical response was obtained from the sample with a nominal nitrogen concentration of 0.1 wt. % and with tricresyl phosphate as a binder. During the development of a differential pulse stripping voltammetric method for carbendazim determination applying new electrode, the following experimental parameters were studied: the sort and amount of binding liquid, the effect of pH, accumulation potential and accumulation time. Under optimal conditions, the electrode offered linearity in the wide concentration range from 25 to 490 ng cm-3 and an estimated detection limit of 1.21 ng cm-3. Moreover, the electrode showed good stability, high selectivity and satisfactory anti-interference ability. Finally, the developed method was successfully applied for the determination of carbendazim traces in spiked tap and river water samples. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. III 45006]

Tetrabutylammonium Chloride Modified Carbon Paste Electrode for Rapid and Highly Sensitive Voltammetric Determination of Carbendazim

“…Additionally, in B-R buffer pH 11.98, oxidation peak of CBZ did not appear probably due to more pronounced instability of target analyte in highly alkaline solutions. 64 However, TBACl-CPE provides CBZ determination in wider pH range in comparison with earlier reported methods, where voltammetric measurements were performed till pH 8.0, 41,42,44,46,63,65,66 pH 9.0 31,32,47 and pH 10.0. 67,68 Furthermore, corresponding E p -pH dependence (inset, Fig.…”

“…These findings are in good agreement with earlier reported methods where CBZ was also adsorbed at negative values of E acc for certain t acc in acidic media confirming that CBZ was in mainly positively charged form under investigated experimental conditions. 44,63,65,66 Comparison of SWV and SW-AdSV methods for CBZ determination.-After basic optimization steps and using TBACl-CPE, direct SWV and SW-AdSV methods were developed for CBZ determination in model solution (pH 5.0) prior to its analysis in selected samples. The direct anodic SWV determination of CBZ was based on the linear relationship between the I p and CBZ concentration from 2.5 to 280.0 ng ml −1 , as it can be seen from the recorded voltammograms presented in Fig.…”

Fabrication of Carbon Paste Electrode Modified with Phenol Imprinted Polyaniline as a Sensor for Phenol Analysis by Potentiometric

“…Phenol can affect the taste and smell of drinking water with concentrations limit mg/ L. The surface of carbon paste electrode is easily modified so widely used in the electrochemical field because of its low cost, wide potential range, low background current, and minimum sample used in the measurement. Modification of the surface electrode by the electrochemical technique is developed due to selective and sensitive determination of phenol [4][5][6][7]. Electrochemical modification on the electrode surface can be done by several techniques.…”