Results 241 to 250 of about 177,068 (269)
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Determination of vanadium in sea water by catalytic adsorptive cathodic stripping voltammetry
Analytica Chimica Acta, 1994A new procedure for the direct determination of picomolar levels of cobalt in seawater is presented. Cathodic stripping voltammetry is preceded by adsorptive accumulation of the cobalt−nioxime (cyclohexane-1,2-dione dioxime) complex from seawater containing 6 μM nioxime and 80 mM ammonia at pH 9.1, onto a hanging mercury drop electrode, followed by ...
Marisol Vega, Constant M.G. van den Berg
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Adsorptive cathodic stripping voltammetry of trace elements in sea water
The Analyst, 1989Large advances have been made in the application of cathodic stripping voltammetry (CSV) to the determination of trace elements in the environment. A monomolecular layer of complexes on a mercury electrode is allowed to adsorb directly from aqueous solution during the pre-concentration step, which is followed by measurement of the reduction current by ...
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Adsorptive cathodic stripping voltammetry determination of ultra trace levels of cobalt
Transition Metal Chemistry, 2009The complexation of Co(II) with 4-(2-pyridylazo)resorcinol (PAR) was studied by spectroscopy and voltammetry. In addition, an adsorptive stripping voltammetric method was developed for the determination of ultra trace levels of Co(II) using a hanging mercury drop electrode.
Laleh Hosseinzadeh +3 more
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Determinationation of kanamycin by square-wave cathodic adsorptive stripping voltammetry
Russian Journal of Electrochemistry, 2008A square-wave cathodic adsorptive stripping voltametric (SWCASV) method for the determination of kanamycin was developed on a thin-film mercury electrode (TFME). The optimal working conditions for the application of the method were found to be pH 8.0, provided by a Britton-Robinson (B.R.) buffer, and an adsorption potential of +0.30 V during 300 s. The
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Cathodic Adsorptive Stripping Voltammetry of Cytosine and Guanine in Presence of Acridine Orange
Analytical Letters, 2005Abstract A cathodic adsorptive electrochemical behavior of cytosine and guanine in the presence of acridine orange (DNA‐intercalating dye) at the static mercury drop electrode was investigated. Optimum experimental conditions were found to be the use of a 0.001 M NaOH solution with an acridine orange concentration of 2 ppm, an initial potential of −0.0
Percio A. M. Farias +2 more
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Rapid adsorptive cathodic stripping voltammetry of zinc complexes in sea water
Analytica Chimica Acta, 1993The effects of the potential scan speed on the adsorptive cathodic stripping voltammetric determination of zinc-tetramethylenedithiocarbamate complexes in sea water were investigated. It was observed that an increase in scan speed increases the peak height and peak width, shifts the peak potential towards negative values and increases the capacitance ...
Hernández-Brito, J. J. +3 more
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High‐Performance adsorptive cathodic stripping voltammetry of nickel and cobalt in seawater
Electroanalysis, 1994AbstractThe voltammetric determination of trace metals in seawater suffers from the interference of dissolved oxygen and engine vibrations onboard ship. It is here attempted to overcome these interferences using a high‐frequency (1 to 20 kHz) staircase modulation during the voltammetric scan (high‐performance adsorptive cathodic stripping voltammetry ...
Pérez‐Peña, J. +4 more
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Assay of dipyridamole in human serum using cathodic adsorptive square-wave stripping voltammetry
Analytical and Bioanalytical Chemistry, 2002A rapid and sensitive square-wave voltammetric procedure was optimized for the determination of dipyridamole after its adsorption preconcentration onto a hanging mercury drop electrode. The peak current of the first of the two peaks developed for this drug in Britton-Robinson buffer at pH 8.0 has been considered for the present analytical study.
M M, Ghoneim, A, Tawfik, A, Radi
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Analytica Chimica Acta, 2006
A mercury coated, gold, micro-wire electrode is used here for the determination of iron in seawater by catalytic cathodic stripping voltammetry (CSV) with a limit of detection of 0.1 nM Fe at a 60s adsorption time. It was found that the electrode surface is stable for extended periods of analyses (at least five days) and that it is reactivated by ...
Jenny, Gun +2 more
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A mercury coated, gold, micro-wire electrode is used here for the determination of iron in seawater by catalytic cathodic stripping voltammetry (CSV) with a limit of detection of 0.1 nM Fe at a 60s adsorption time. It was found that the electrode surface is stable for extended periods of analyses (at least five days) and that it is reactivated by ...
Jenny, Gun +2 more
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Bioelectrochemistry, 2009
The stripping voltammetric behaviour of drotaverine hydrochloride (DvCl) was studied using a hanging mercury drop electrode (HMDE). The adsorptive stripping response has been evaluated with respect to pH, accumulation time, accumulation potential, scan rate and other variables.
S I M, Zayed, Y M, Issa
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The stripping voltammetric behaviour of drotaverine hydrochloride (DvCl) was studied using a hanging mercury drop electrode (HMDE). The adsorptive stripping response has been evaluated with respect to pH, accumulation time, accumulation potential, scan rate and other variables.
S I M, Zayed, Y M, Issa
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