The development of electroanalytical method for the determination of 2,4-dichlorophenoxyacetic acid using bismuth modified screen printed carbon electrodes

Abstract

The aim of this work was to develop electroanalytical method for the analysis of 2,4-Dichlorophenoxy acetic acid (2,4-D) through electrode modification. The electrode modification has been done by single potential step electrodeposition of bismuth film on screen-printed carbon electrodes. Under the optimized conditions deposition potential -1050 mV, deposition time 180 s, concentration bath Bi (III) ion 2 mM and pH 11; the nitrated 2,4-D showed dynamic linear concentration range from 11.1 to 74.3 µM with regression coefficient (R) of 0.9988. The limits of detection and quantification were 3.15 and 10.5 µM, respectively. The proposed method offered higher sensitivity compared to bare screen-printed carbon electrode. The modified electrode showed good reproducibility, repeatability, stability and recovery for the analysis of 2,4-D. The developed method was used for electroanalysis of 2,4-D in soil and water samples collected from Sito Kebele, Dedo district Jimma zone.