Fabrication A Composite Electrode Based on MWCNT/Zeolite for Potentiometric Determination of Chromium (III)

摘要

A nanocomposite based on carbon paste electrode fabricated, by using zeolite as ion carrier .Functional multi-wall carbon nanotube was used for improvement of electrode response.The optimal composition of CPE was built from 65% graphite powder, 20 wt% paraffin oil, 5% ion carrier (zeolite), 10% MWCNTs. Electrode showed Nemstian response 19.88 (±0.2)mVdecade~(-1) in the measuring range 10~("7)-10~("2) mol L~("1) and showed detection limit of 6.3x10~(-7) M. The sensor was successfully used for potentiometric titration Cr~(3+) with EDTA. The carbon paste electrode showed fast response time, good selectivity and applicable in the wide pH range of 3 -10.