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- atomic-absorption-spectrometry 1
- copper 1
- disease 1
- electrochemical oxidation 1
- glassy-carbon electrode 1
- ions 1
- iron 1
- monolayers 1
- organic layers 1
- paste electrode 1
- preconcentration 1
- rectification 1
- reduction 1
- spectrophotometric determination 1
- spectroscopy 1
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- trace amounts 1
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Ali Osman SOLAK
Article | 2011 | Analytical Methods3 ( 11 )
In this study, electrochemical modification of a glassy carbon (GC) electrode with apigenin was carried out and the modified electrode was used for determination of copper(II) (Cu(II)) in soil samples. The GC was modified through the electrochemical polymerization of apigenin (PolyApi/GC) on the electrode surface in aqueous media. The electrode surface was modified with apigenin in phosphate buffer solution (PBS), pH 7, from 0 mV to +1400 mV potential ranges, using 100 mV s−1 sweep rate and 30 cycles by cyclic voltammetry (CV). The surface characterizations of this sensor electrode were performed by CV, electrochemical impedance spe . . .ctroscopy (EIS) and scanning electron microscopy (SEM). Britton-Robinson (BR) buffer solution at pH 5 was used for determination of Cu(II) by differential pulse voltammetry (DPV). The detection limit was obtained as lower as 1.0 × 10−11 M. By using this calibration curve, the amount of Cu(II) was determined as 7.34 × 10−7 M in soil samples. The results showed that pH, incubation time and interferences of some cations and anions were significant More less
Ali Osman SOLAK
Article | 2011 | Analytical Methods136 ( 7 )
The scope of this study is to modify a Surface Plasmon Resonance (SPR) sensor slide with isophthalic acid to evaluate the possible application on the detection of copper(II) ions in aqueous media by total internal reflection ellipsometry. A gold sensor surface was modified by an electrochemical diazonium reduction modification method. The modified surfaces are characterized with cyclic voltammetry (CV) and ellipsometry. Isophthalic acid monolayer modified gold slides were used for in situdetection of aqueous Cu2+ solution with the SPR enhanced total internal reflection ellipsometry (SPRe-TIRE) technique. Layer formation, pH dependen . . .cy of adsorption, sensor response of the SPRe-TIRE and isothermal kinetic parameters were examined. A high dependency on the number of CV cycles in the monolayer–multiple layer transition was observed. The suggested sensor gave a linear response over a wide range of Cu2+ concentrations. It was also reported that adsorption on the SPRe-TIRE sensor gave Langmuir adsorption model behavior More less
