Sensitive determination of Cd and Pb by differential pulse stripping voltammetry with in situ bismuth-modified zeolite doped carbon paste electrodes

2008 ◽  
Vol 53 (5) ◽  
pp. 2177-2182 ◽  
Author(s):  
Linyuan Cao ◽  
Jianbo Jia ◽  
Zhenhui Wang
Keyword(s):  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Carbon Paste ◽  
Modified Zeolite ◽  
Carbon Paste Electrodes ◽  
Sensitive Determination ◽  
Differential Pulse Stripping Voltammetry

scholarly journals Electrochemical Behavior and Determination of Rutin on Modified Carbon Paste Electrodes

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Pavla Macikova ◽  
Vladimir Halouzka ◽  
Jan Hrbac ◽  
Petr Bartak ◽  
Jana Skopalova
Keyword(s):  
Soxhlet Extraction ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Carbon Paste ◽  
Carbon Paste Electrodes ◽  
Pulse Voltammetry ◽  
Paste Electrode ◽  
Pressurized Solvent Extraction ◽  
Modified Carbon Paste Electrodes

The performances of ionic liquid (1-hexyl-3-methylimidazolium-bis(trifluoromethylsulfonyl)imide, IL/CPE) and iron phthalocyanine (IP/CPE) modified carbon paste electrodes in electroanalytical determinations of rutin were evaluated and compared to the performance of unmodified carbon paste electrode (CPE). Cyclic voltammetry (CV), differential pulse voltammetry (DPV), differential pulse adsorptive stripping voltammetry (DPAdSV), and amperometry were used for rutin analysis. The best current responses of rutin were obtained at pH 4.0 for all tested techniques. IL/CPE electrode was found to perform best with DPAdSV technique, where a detection limit (LOD) as low as 5 nmol L-1of rutin was found. On the other hand, IP/CPE showed itself to be an optimum choice for DPV technique, where LOD of 80 nmol L-1was obtained. Analytical applicability of newly prepared electrodes was demonstrated on determination of rutin in the model samples and the extracts of buckwheat seeds. To find an optimum method for buckwheat seeds extraction, a boiling water extraction (BWE), Soxhlet extraction (SE), pressurized solvent extraction (PSE), and supercritical fluid extraction (SFE) were tested.

Determination of chloramphenicol by differential pulse voltammetry at carbon paste electrodes – The use of sodium sulfite for removal of oxygen from electrode surface

2011 ◽  
Vol 76 (5) ◽  
pp. 383-397 ◽  
Author(s):  
Ferenc T. Pastor ◽  
Hana Dejmková ◽  
Jiří Zima ◽  
Jiří Barek
Keyword(s):  
Differential Pulse Voltammetry ◽  
Glassy Carbon ◽  
Sodium Sulfite ◽  
Differential Pulse ◽  
Optimal Conditions ◽  
Carbon Paste ◽  
Tricresyl Phosphate ◽  
Carbon Paste Electrodes ◽  
Pulse Voltammetry

The possibility of determination of chloramphenicol by differential pulse voltammetry at four different carbon paste electrodes, in the full pH range (2–12) of Britton–Robinson (BR) buffer was investigated. Electrodes were prepared by mixing spectroscopic graphite powder or glassy carbon microbeads with mineral oil (Nujol) or tricresyl phosphate. Under optimal conditions (BR buffer pH 12, the electrode prepared from glassy carbon microbeads and tricresyl phosphate), linear calibration graph was obtained only in 10–5 M chloramphenicol concentration range. Determination of lower concentrations of chloramphenicol was complicated by irreproducible peak of oxygen from the carbon paste which overlapped with peak of chloramphenicol. Addition of sodium sulfite removed the oxygen peak without influence on the peak of chloramphenicol. Under optimal conditions (electrode paste made from glassy carbon microbeads, BR buffer pH 10 and 0.5 M sodium sulfite), straight calibration line was obtained in the 10–6 and 10–5 M chloramphenicol concentration range. Limit of determination was 5 × 10–7 mol/l.

Fabrication of chemically and in situ modified carbon paste electrodes for the potentiometric determination of chlorpromazine HCl in pure pharmaceutical preparations, urine and serum

2017 ◽  
Vol 41 (24) ◽  
pp. 15612-15624 ◽  
Author(s):  
Gehad G. Mohamed ◽  
Eman Y. Z. Frag ◽  
M. A. Zayed ◽  
M. M. Omar ◽  
Sally E. A. Elashery
Keyword(s):  
Biological Fluids ◽  
Pharmaceutical Preparations ◽  
Pharmaceutical Formulations ◽  
Carbon Paste ◽  
Chlorpromazine Hydrochloride ◽  
Carbon Paste Electrodes ◽  
Urine And Serum ◽  
Modified Carbon Paste Electrodes

Newly developed modified and in situ modified carbon paste sensors were developed for the determination of chlorpromazine hydrochloride (CPZHC) in pharmaceutical formulations and biological fluids (urine and serum).

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