Results 211 to 220 of about 560 (248)
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Copper complexing capacities of freshwaters by adsorptive cathodic stripping voltammetry
Analytica Chimica Acta, 2000Abstract Copper complexation in freshwater was investigated by cathodic stripping voltammetry (CSV) with ligand competition using 8-hydroxyquinoline (oxine). Complexing capacity titrations were used to determine concentrations of natural copper complexing ligands and their conditional stability constants. The effect of the adsorption potential on the
Li Jin, Niall J. Gogan
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Talanta, 2000
A very sensitive and selective catalytic adsorptive cathodic stripping procedure for trace measurements of cobalt is presented. The method is based on adsorptive accumulation of the cobalt-MTB (methyl thymol blue) complex onto a hanging mercury drop electrode, followed by reduction of the adsorbed species by voltammetric scan using differential pulse ...
A, Safavi, E, Shams
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A very sensitive and selective catalytic adsorptive cathodic stripping procedure for trace measurements of cobalt is presented. The method is based on adsorptive accumulation of the cobalt-MTB (methyl thymol blue) complex onto a hanging mercury drop electrode, followed by reduction of the adsorbed species by voltammetric scan using differential pulse ...
A, Safavi, E, Shams
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Talanta, 2000
A reliable and very sensitive procedure for the determination of trace levels of molybdenum in seawater is proposed. The complex of molybdenum with 8-hydroxyquinoline (Oxine) is analyzed by cathodic stripping square-wave voltammetry based on the adsorption collection onto a hanging mercury drop electrode (HMDE).
Y C, Sun, J, Mierzwa, C R, Lan
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A reliable and very sensitive procedure for the determination of trace levels of molybdenum in seawater is proposed. The complex of molybdenum with 8-hydroxyquinoline (Oxine) is analyzed by cathodic stripping square-wave voltammetry based on the adsorption collection onto a hanging mercury drop electrode (HMDE).
Y C, Sun, J, Mierzwa, C R, Lan
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Journal of Hazardous Materials, 2009
In this work bovine albumin was used innovatively as a medium for adsorptive accumulation of Se-I(2) on thin mercury film electrode. Se-I(2) was formed by reaction between Se(IV) and iodide in HCl media. The adsorbed Se-I(2) was stripped in 0.05 M HCl by differential pulse cathodic potential scan.
Mehdi, Ashournia, Alireza, Aliakbar
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In this work bovine albumin was used innovatively as a medium for adsorptive accumulation of Se-I(2) on thin mercury film electrode. Se-I(2) was formed by reaction between Se(IV) and iodide in HCl media. The adsorbed Se-I(2) was stripped in 0.05 M HCl by differential pulse cathodic potential scan.
Mehdi, Ashournia, Alireza, Aliakbar
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A Kinetic Study of Nickel Complexation in Model Systems by Adsorptive Cathodic Stripping Voltammetry
Environmental Science & Technology, 2001Adsorptive cathodic stripping voltammetry (AdCSV) in conjunction with the competing ligand-exchange method (CLEM) was investigated as a tool for measuring dissociation rate coefficients of nickel complexes in model systems. Dimethylglyoxime (DMG) was used as the competing ligand.
V, Celo +3 more
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Journal of Electroanalytical Chemistry and Interfacial Electrochemistry, 1987
Abstract A voltammetric method for the determination of 3-mercapto-D-2-methylpropanoyl-L-proline, a hypotensive drug whose pharmaceutical name is Captopril (CPT), in the concentration range from 9.0×10 −10 M to 3×10 −6 M , is described. In this range the peak current increases linearly with drug concentration even when different collection periods
PASSAMONTI, Paolo +2 more
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Abstract A voltammetric method for the determination of 3-mercapto-D-2-methylpropanoyl-L-proline, a hypotensive drug whose pharmaceutical name is Captopril (CPT), in the concentration range from 9.0×10 −10 M to 3×10 −6 M , is described. In this range the peak current increases linearly with drug concentration even when different collection periods
PASSAMONTI, Paolo +2 more
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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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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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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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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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