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Chinese Chemical Letters 2010年第6期21卷 725-729页

作者： ali benvidi Fatemeh Heidari M.Mazloum Ardakani ali Mohammad Hajishabani Jahanbakhsh Ghasemi Department of Chemistry Yazd UniversityYazdIran Department of Chemistry Khajeh Nasir Toosi University of TechnologyIran

The acidity constants of TAR in different water-organic solvent binary mixtures at 25℃have been determined spectrophotometrically. DATa ANalysis（DATAN） program was used for calculations of the acidity constants and pure spectra of all formed species and their concentration distribution diagram in applied pH *** show that there are a fairly inverse relationship between acidity constants and the mole fraction of the organic solvent in the binary *** of solvent composition on the pK;s and pure spectrum of each component are also discussed.

关键词： TAR DATAN Principal component analysis Acidity constants Binary solvents

Electrochemical determination of vitamin C in the presence of uric acid by a novel TiO_2 nanoparticles modified carbon paste electrode

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Chinese Chemical Letters 2010年第12期21卷 1471-1474页

作者： Mohammad Mazloum-Ardakani Mohammad ali Sheikh-Mohseni Hadi Beitollahi ali benvidi Hossein Naeimi Department of Chemistry Faculty of ScienceYazd UniversityYazd89195-741I.R.Iran Department of Organic Chemistry Faculty of ChemistryUniversity of KashanKashanI.R.Iran

The electrochemical behavior of vitamin C（ascorbic acid or AA） is investigated on the surface of a carbon-paste electrode modified with TiO2 nanoparticles and 2,2＇-（1,2 butanediylbis（nitriloethylidyne））-bis-hydroquinone（BBNBH）.The prepared modified electrode showed an efficient catalytic role in the electrochemical oxidation of AA,leading to remarkable decrease in oxidation overpotential and enhancement of the kinetics of the electrode *** modified electrode exhibits well-separated oxidation peaks for AA and uric acid（UA）.The modified electrode is successfully applied for the accurate determination of AA in pharmaceutical preparations.

关键词： Ascorbic acid Uric acid TiO2 nanoparticles Electrocatalysis Modified carbon paste electrode

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Iodide-selective polymeric membrane electrode based on copper(Ⅱ) bis(N-2-bromophenylsalicyldenaminato) complex

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Chinese Chemical Letters 2011年第9期22卷 1087-1090页

作者： ali benvidi M.T.Ghanbarzadeh M.Mazloum-Ardakani R.Vafazadeh Department of Chemistry Yazd UniversityYazdIran

A PVC membrane electrode based on copper（II） bis（N-2-bromophenylsalicyldenaminato） as ionophor was prepared. The ion selective electrode was tested by inorganic anions and showed a good selectivity for iodide ion. This sensor exhibited Nernstian behavior with a slope of -57.8 mV per decade at 25℃. The proposed electrode showed a linear range from 1.0 × 10 ^-5 to 1.0 × 10 ^-1 mol/L with a detection limit of 5.0 × 10 ^-6 mol/L. The electrode response was independent of pH in the range of 3.0- 10.0. The proposed sensor was applied to determine the iodide in water and antiseptic samples.

关键词： Iodide-selective electrode Polymeric membrane Potentimetry

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Electrocatalytic oxidation of hydrazine on magnetic bar carbon paste electrode modified with benzothiazole and iron oxide nanoparticles: Simultaneous determination of hydrazine and phenol

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Chinese Journal of Catalysis 2016年第4期37卷 549-560页

作者： ali benvidi Shahriar Jahanbani Bibi-Fatemeh Mirjalili Reza Zare 亚兹德大学化学系

A magnetic bar carbon paste electrode （MBCPE） modified with Fe3O4 magnetic nanoparticles （Fe3O4NPs） and 2‐（3,4‐dihydroxyphenyl） benzothiazole （DPB） for the electrochemical determina‐tion of hydrazine was developed. The DPB was firstly self‐assembled on the Fe3O4NPs, and the re‐sulting Fe3O4NPs/DPB composite was then absorbed on the designed MBCPE. The MBCPE was used to attract the magnetic nanoparticles to the electrode surface. Owing to its high conductivity and large effective surface area, the novel electrode had a very large current response for the electrocat‐alytic oxidation of hydrazine. The modified electrode was characterized by voltammetry, scanning electron microscopy, electrochemical impedance spectroscopy, infrared spectroscopy, and UV‐visible spectroscopy. Voltammetric methods were used to study the electrochemical behaviour of hydrazine on MBCPE/Fe3O4NPs/DPB in phosphate buffer solution （pH = 7.0）. The MBCPE/Fe3O4NPs/DPB, acting as an electrochemical sensor, exhibited very high electrocatalytic activity for the oxidation of hydrazine. The presence of DPB was found to reduce the oxidation potential of hydrazine and increase the catalytic current. The dependence of the electrocatalytic current on the hydrazine concentration exhibited two linear ranges, 0.1–0.4 μmol/L and 0.7–12.0 μmol/L, with a detection limit of 18.0 nmol/L. Additionally, the simultaneous determination of hydrazine and phe‐nol was investigated using the MBCPE/Fe3O4NPs/DPB electrode. Voltammetric experiments showed a linear range of 100–470 μmol/L and a detection limit of 24.3 μmol/L for phenol, and the proposed electrode was applied to the determination of hydrazine and phenol in water samples.

关键词： Modified electrode Electerocatalytic oxidation Hydrazine Phenol Magnetic bar modified carbon paste electrode Fe3O4 nanoparticle

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