Self‐Assembled Mercapto‐Compound‐Gold‐Nanoparticle‐Modified Carbon Paste Electrode for Potentiometric Determination of Cadmium(II) |
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| Authors: | Mohammad?Hossein Mashhadizadeh Khadijeh Eskandari Alireza Foroumadi Abbas Shafiee |
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| Institution: | 1. Faculty of Chemistry, Tarbiat Moallem University, Tehran, Iran;2. Department of Medicinal Chemistry, Faculty of Pharmacy and Pharmaceutical Sciences Research Center, Tehran University of Medical Sciences, Tehran 14174, Iran |
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| Abstract: | A new modified carbon paste electrode (CPE) based on a recently synthesized ligand 2‐mercapto‐5‐(3‐nitrophenyl)‐1,3,4‐thiadiazole] (MNT), self‐assembled to gold nanoparticles (GNP) as suitable carrier for Cd(II) ion with potentiometric method are described. The proposed electrode exhibits a Nernstian slope of 29.4±1.0 mV per decade for Cd(II) ion over a wide concentration range from 3.1×10?8 to 3.1×10?4 mol L?1. The detection limit of electrode was 2.0×10?8 mol L?1 of cadmium ion. The potentiometric responses of electrode based on MNT is independent of the pH of test solution in the pH range 2.0–4.0. It has quick response with response time of about 6 s. The proposed electrode show fairly good selectivity over some alkali, alkaline earth, transition and heavy metal ions. Finally, the proposed electrode was successfully employed to detect Cd(II) ion in hair and water samples. |
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| Keywords: | Gold nanoparticles Self‐assembly Mercapto compound Potentiometric sensor Carbon paste electrode Cadmium ion |
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