| Different materials and the proportion of modifier chemically modified carbonpaste electrode preparation and application in the determination of copper ions, whichget a new fast method and accurate detection of copper ions. Specific related work asfollows.Through the application of hydrogen peroxide, acidification, dimethyl formamide,and the first calcined and then acidified four treatment on CNT purified, and thenprepared Modified carbon paste electrode, it analyzed the determination of the copperion solution. The results comparing the2.4×10-8mol·L-1ideal purification method.Using ethylene diamine tetraacetic acid （EDTA） for the modifying agents preparedcarbon paste modified electrode, EDTA and copper ions complex, The copper ions inthe electrolyte solution is enriched in the surface modified electrode, wherein the centralatom is a Cu2+, the ligand is the modifying agent, Negative potential of the copper ionadded to restore the modified electrode surface, Finally Anode scanning process isoxidized to the solution, By oxidation-reduction reaction to determine the copper ions inthe solution, convenient operation is easy and the effect is good, the detection limit is1.8×10-8mol·L-1.Prepared Carbon Nanotubes+EDTA modified carbon paste electrode can formedCNT special hollow structure and strong adsorption, complexation of EDTA withcopper ions accelerate the electrochemical reaction to promote copper ions in thesurface of the electrode, so that the reaction is more complete, greatly enhance thesensitivity of the electrode to achieve the accuracy of the determination. Chemicallymodified carbon paste electrode and water samples were measured, and get betterresults up to3.2×10-9mol·L-1,standard addition method in the determination of theaccuracy of correlation coefficient is r=0.9992.Compared with now forming carbonsodium nanotubes modified glassy carbon electrode determination of copper ions, thedetection limit is7.5×10-9mol·L-1. with the best CMCPE do comparative experimentsultimately prove to carbon nanotubes+EDTA modified CPE feasibility and accuracy.Due to Daqing City rishang instrument manufacturing PS4.0microcomputerpolarograph working electrode is in the glassy carbon electrode, and it is acquired. Continuous improvement through the experiment, this paper developed a low cost, thesensitivity is3.2×10-9mol·L-1, The chemically modified carbon paste electrode isaverage recovery up to99.82%, it can be batch preparation and strong stability. Providetechnical support for enterprise research and development production, create economicbenefits. |
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