scholarly journals Determination of Thallium(I) by Hybrid Mesoporous Silica (SBA-15) Modified Electrode

2016 ◽  
Vol 2016 ◽  
pp. 1-7
Author(s):  
Geeta Rani ◽  
Sanjay Singh
Keyword(s):  
Mesoporous Silica ◽  
Potential Method ◽  
Selectivity Coefficient ◽  
Indicator Electrode ◽  
Carbon Paste ◽  
Chemically Modified ◽  
Best Response ◽  
Edta Solution ◽  
Paste Electrode

Chemically modified mesoporous silica material (SBA-15) was used for the construction of Tl(I) selective carbon paste electrode. The best response was found with the electrode containing 10% modifier as electrode material. The electrode has a lower detection limit of 6.0 × 10−9 M in a working concentration range of 1.0 × 10−8–1.0 × 10−1 M. The selectivity coefficient calculated by match potential method (MPM) shows the high selectivity of electrode towards Tl(I) over other tested ions. The electrode was successfully applied as an indicator electrode for the titration of 0.01 M TlNO3solution with standards EDTA solution and for sequential titration of mixture of different anions.

Determination of Tryptophan Using Nanocomposite-Based Sensor

2013 ◽  
Vol 829 ◽  
pp. 675-680 ◽  
Author(s):  
Akbar Islamnezhad ◽  
Esmaeil Farzaneh Jobaneh
Keyword(s):  
Catalytic Effect ◽  
Basic Solution ◽  
Carbon Paste ◽  
Experimental Conditions ◽  
Chemically Modified ◽  
Solvent Free Condition ◽  
Analytical Response ◽  
Paste Electrode ◽  
Effect Of The Composition

In this study, the nanoComposite Silica Perchloric Acid Poly (2-Methyl Aniline) (NSPPMA) was synthesized under the solvent-free condition and used as modifier in preparation of chemically modified electrode (CME). The effect of the composition of carbon paste electrode on its voltammograms were evaluated in basic solution with 5.0 × 105 M Trp. It was found that addition of NSPPMA to the carbon paste would generate the peak current of Trp because of its catalytic effect on redox process. The best analytical response was obtained at pH 12.0. The anodic peak currents were proportional to Trp concentrations in the range of 2.5 × 109 5.0 × 10-4 M under the optimized experimental conditions. The detection limit was 1.7 × 10-10 M. The correlation of the peak currents against v1/2 (v is the scan rate) is linear. The proposed method was applied to the determination of Trp in pharmaceuticals formulations successfully.

scholarly journals Graphene oxide quantum dots immobilized on mesoporous silica: preparation, characterization and electroanalytical application

RSC Advances ◽  
2020 ◽  
Vol 10 (52) ◽  
pp. 31305-31315
Author(s):  
Albina Mikhraliieva ◽  
Vladimir Zaitsev ◽  
Oleg Tkachenko ◽  
Michael Nazarkovsky ◽  
Yutao Xing ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Mesoporous Silica ◽  
Carbon Paste Electrode ◽  
Carbon Paste ◽  
Silica Network ◽  
Graphene Oxide Quantum Dots ◽  
Paste Electrode

Graphene oxide quantum dots incorporated into a mesoporous silica network have been used as a modifier of a carbon paste electrode for the determination of antibiotics and hormones.

scholarly journals Preparation and Charactreization Selective Electrode for Determination of CopperIon(II)

2016 ◽  
Vol 5 (4) ◽  
pp. 237
Author(s):  
Salwa Fares Rassi
Keyword(s):  
Carbon Paste Electrode ◽  
Linear Response ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Selective Electrode ◽  
Chemically Modified ◽  
Diphenyl Carbazide ◽  
Nernstian Slope ◽  
Paste Electrode

<span>Achemically modified carbon paste electrode with diphenyl carbazide the potentiometric determination of Cu(II) is demonstrated. The electrode exhibits linear response to Cu(II) over a wide concentration range (9.2×10−7-5.0×10−1) with Nernstian slope of 30±0.15 mV per decade. It has a response time of about 40 s and can be used for a period of two months with good reproducibility. The detection limit of this electrode was 7.0×10−7 M. The proposed electrode shows a very good selectivity for Cu(II) over a wide variety of metal ions. This chemically modified carbon paste electrode was successfully used for the determination of Cu(II) in various water samples solution and pharmaceutical formulation</span>

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