Abstract
The effect of gold electrode modified with 2,3-Diaminonaphthalene (GEMDANN) or multi-modified or a mixture 2,3-diaminonaphthalene and o-phenylenediamine -nafion (GEMDAN-OPDAN) on determination of selenium (IV) using differential pulse anodic stripping voltammetric analysis (DPASVA) has been studied. Various parameters (electrolyte, deposition time, pulse duration, pulse amplitude, etc.) are affecting determination of the Se(IV) in HClO4 (0.2 M) at pH 0.22 were examined. Under the optimum conditions, liner calibration graph, Ip=f(CSe4+), were obtained in the concentration ranges of 5x10-8 - 1x10-6 M (3.948 -78.96 ng.mL-1 ) with relative standard deviations (RSD) 4.2% and detection limit 0.056 ng.mL-1, and 1x10-9 -1x10-6 M (0.07896 -78.96 ng.mL-1 ) with relative standard deviations (RSD) 4.9% and detection limit was 0.014 ng.mL-1 on GEMDANN and GEMDAN-OPDAN, respectively. This method showed a good accumulation efficiency for selenium and good resistance to interferences from metal ions as well as those associated with selenium in pharmaceuticals. The results for the determination of Se4+ using GEMDAN-OPDAN (multi-modified) were more sensitive (about 50 times) than that obtained using GEMDANN.
Highlights
The performance of a poly (1,8-diaminonaphthalene)-modified gold electrode (PDAN-Au) for the determination of the selenium (IV) ion in an aqueous medium was investigated with anodic stripping voltammetry without the pretreating of the sample
The peak potential is -0.545 V, and the calibration curve is linear up to 0.125 ng.mL1, but selenium was determined in the range 8 to 64 ng.mL-1 in pharmaceutical products [2]
Differential pulse anodic stripping voltammetric analysis of selenium (IV) using a gold electrode modified with 3,3′-diaminobenzidine.4HCl-nafion (GEMDN) has been studied
Summary
The performance of a poly (1,8-diaminonaphthalene)-modified gold electrode (PDAN-Au) for the determination of the selenium (IV) ion in an aqueous medium was investigated with anodic stripping voltammetry without the pretreating of the sample. Differential pulse anodic stripping voltammetric analysis of selenium (IV) using a gold electrode modified with 3,3′-diaminobenzidine.4HCl-nafion (GEMDN) has been studied. Differential pulse anodic stripping voltammetric determination of selenium (IV) using a vitamin E-nafion modified gold electrode has been studied. The effect of gold electrode modified with GEMDANN and gold electrode multi-modified with a mixture o-phenylenediamine and 2,3-diaminonaphthalene-nafion on determination of selenium (IV) using differential pulse anodic stripping voltammetric analysis has been studied. 2.5 Preparation of modified gold electrode (GEMDANN) Gold electrode was first polished, rinsed with deionized water and ultrasonicated successively in a 1:1 aqueous solution of nitric acid and an ethanol solution for 3 min and dried. Gold electrode was first polished, rinsed with deionized water and ultrasonicated successively in a 1:1 aqueous solution of nitric acid and an ethanol solution each for 3 min and dried. The electrode was dried to evaporate the solvent and rinsed with deionized water (GEMDAN-OPDAN)
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