| Autor: |
EL Ouafy, Hayat, EL Ouafy, Tarik, Oubenali, Mustapha, EL Idrissi, Mohammed, Echajia, Malika, EL Haimouti, Aziz, Mbarki, Mohamed, Oulfajrite, Hassan |
| Předmět: |
|
| Zdroj: |
Analytical & Bioanalytical Electrochemistry; 2/29/2020, Vol. 12 Issue 2, p168-179, 12p |
| Abstrakt: |
Clay modified carbon paste electrode (CPE-C) its applicability for electroanalysis of N, N'-ethylene-2,2'-bipyridinium (diquat) has been described in the present work. Electrochemical modification was performed by electronic impedance spectroscopy (EIS) and cyclic voltammetry (CV) in the range of -0.6 V to 1.2 V in 0.1 M K2SO4 (pH 3). The voltammetric method behavior of DQ is suggested where an anodic and cathodic peak appeared at Epa=0.55 V and Epc=0.1 V, successively. These peaks obtained from the reversible redox of DQ at the CPE-C surface. The optimal preconcentration time and percentage of clay insert were 10 min and 20% respectively. The proposed method exhibits certainly an electro-catalytic success toward DQ redox. The peaks current recorded using cyclic voltammetry has been linearly dependent on the DQ concentration ranging from 1x10-5 to 5x10-5 molL-1. The detection limit (DL) calculated for the anodic peak is 5.33x10-5 molL-1. Then relative standard deviation for 2x10-5 molL-1diquat has been 4.3% for nine repetitions. The proposed detector has been successfully applied for DQ electroanalysis in a river water sample with a DL of 8.17x10-8 molL-1. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
