Document Type : Research Paper
Department of Chemistry, Ecology and Pharmacy, Lesya Ukrainka Volyn National University, Lutsk, 43000 Ukraine
School of Chemistry and Biochemistry, Thapar Institute of Engg and Technology (Deemed University), Patiala 147004 India
Department of Organic and Physical Chemistry Chernivtsi National University, Kotsyubyns´ky Str. 2, Chernivtsi, 58000 Ukraine
Ionic associates of basic fuchsin have been used as electrochemical sensing probe for the potentiometric determination of 2,4-dichlorophenoxyacetic acid (2,4-D) and 4-chlorophenoxyacetic acid (4-CPA). Influence of the membrane composition on electroanalytical characteristics of the electrodes has been established. Effect of the modifying additive (N,N,N',N'-tetramethylethylenediamine) on the chemical and analytical characteristics of the electrodes is shown. The sensors can be used for the determination of 2,4-D (4-CPA) in an analytical range of 1×10-4 to 3×10-2 M with LOD as 10-5 M. For 2,4-D ISE, a hyper-Nernstian function was observed. The sensors have been applied for the determination of 4-CPA and 2,4-D in model solutions of pesticide preparations.
The ion-selective electrode may be efficiently used in either model or real samples, providing a low detection limit detection;
The electrode may be made more efficient, if the lypophylic basic additive is used for electrode production. Its addition has significant importance for the electrode response.