The reliable determination of mercury traces in sea water by subtractive differential pulse voltammetry at the twin gold electrode

Sípos, László; Nürnberg, H. W.; Valenta, P.; Branica, Marko

doi:10.1016/s0003-2670(01)93140-x

Cited by 78 publications

(36 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The sensitivity at the SMSPE divided by electrode area and preconcentration time gives a 'specific' sensitivity value of 250 nA nM -1 min -1 cm -2 which is comparable with the 'specific' sensitivities of 300-500 nA nM ¹1 min ¹1 cm ¹1 , calculated from literature data relevant to mercury determinations at rotating disk gold electrodes [2][3][4].…”

Section: Resultssupporting

confidence: 71%

“…One of the main interference in the voltammetric determination of trace mercury is related to the possible codeposition of copper [21]; for instance in the case of rotating disk gold electrodes, the reduction of such an interference has required the development of a quite complex pulsed deposition procedure [3]. For this reason we examined the effect of adding increasing amounts of copper on the electrochemical behavior of SMSPE towards mercury.…”

Section: Resultsmentioning

confidence: 99%

“…Different materials such as glassy carbon [1] and gold [2][3][4] were used as working electrodes. The requirement for low detection limits and the minimization of the interference of coexisting metal cations were reached by using various modifiers able to preconcentrate mercury, such as ionexchangers [5][6], macrocyclic ligands [7], polypyrrole derivatives [8][9] and sulfur containing modifiers [10].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Determination of Trace Mercury in Saltwaters at Screen-Printed Electrodes Modified with Sumichelate Q10R

Ugo¹,

Moretto²,

Bertoncello³

et al. 1998

Electroanalysis

107

View full text Add to dashboard Cite

The results of a study on the determination of trace levels of mercury in natural saltwaters using screen-printed carbon electrodes modified with Sumichelate Q10R, a chelating resin containing dithiocarbamate groups, which binds mercury strongly and selectively are reported. Cyclic voltammetric measurements indicate that mercury(II) is preconcentrated by complexation at the modified electrode, giving peak currents which are about one order of magnitude higher than those obtained at an unmodifed screen-printed electrode. The voltammetric pattern is characterized by a broad reduction peak to which a sharp and well-resolved reoxidation peak is associated. Trace (subnanomolar) concentrations of mercury can be determined at the screen-printed modified electrode by adopting a complexation-anodic stripping procedure with detection via differential pulse voltammetry. The method is characterized by a low detection limit (3j blank/sensitivity) of 12 pM with 20 min complexation and 5 min reduction at -0.5 V. Excess copper interferes in the analysis of mercury only when present in more than hundred-fold excess. Data concerning the application of modified screen-printed electrodes to the analysis of mercury in water samples from the channels of Venice (Italy) are presented and discussed.

show abstract

Section: Resultssupporting

confidence: 71%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Determination of Trace Mercury in Saltwaters at Screen-Printed Electrodes Modified with Sumichelate Q10R

Ugo¹,

Moretto²,

Bertoncello³

et al. 1998

Electroanalysis

107

View full text Add to dashboard Cite

show abstract

“…This was demonstrated during the procedures employed for signal optimization. 9.25 x 10 -4 mol/l and 1.64 x 10 -3 mol/l, respectively. A -0.95 V vs. SCE was employed for Tl, Pb2 +, Cd Fig.…”

Section: Resultsmentioning

confidence: 90%

“…Determination of mercury by electroanalytical techniques have recently been described by Sipos et al who used anodic stripping voltammetry (ASV) with a gold working electrode [9], and by Jagner who used potentiometric stripping analysis (PSA) with a glassy carbon working electrode [10][11][12][13]. In the latter technique, elemental copper was co-deposited on the glassy carbon electrode during the potentiostatic deposition step in order to adhere the reduced mercury to the surface of the GCE.…”

Section: Introductionmentioning

confidence: 99%

Determination of mercury in biological fluids by potentiometric stripping analysis

Tutunji

1996

Fresenius J Anal Chem

View full text Add to dashboard Cite

A method is described for the determination of mercury by potentiometric stripping analysis. The analyte, Hg(2+), is employed for oxidizing a fixed amount of cadmium, previously reduced and amalgamated at a thin mercury film preplated on a glassy carbon electrode. The cadmium stripping signal correlates well with the amount of Hg(2+) added. Correlation coefficients of 0.9971 and 0.9960 were obtained for the two working ranges: (25 ng-2.5 microg) and (5.0-50) microg Hg(2+), respectively, in spiked water samples. The method was investigated with respect to precision and accuracy by spiking a natural water sample with 25 microg Hg(2+).Nine replicate determinations gave a mean value of 24.8 microg with a standard deviation +/-0.31 microg. The 95% confidence limit of the mean suggested the absence of systematic errors. Using the highest possible sensitivity, detection limits of 2.0 ng (167 ng/l) and 0.5 ng (4.2 ng/100 ml of whole blood) were obtained in water and blood samples, respectively. The applicability of the method was successfully extended to include the more complex matrices after recording a zero blank from authentic samples spiked with Cd(2+) (25 microg).The described PSA procedure is a simple and rapid method compared with the cold-vapor technique, with a 5.2% and 4.9% RSD, respectively.

show abstract

Electrochemical determination of ultralow levels (<10⁻¹² M) of mercury by anodic stripping voltammetry using a chemically modified electrode

Turyan

Mandler

1994

Electroanalysis

View full text Add to dashboard Cite

A glass!-carbon electrode (GCE) coated with 4.7.13.16.21,24-hexao?ia-l ,lO-diazabic)rclo[8.8.8]hexacosane, %?tofix-222, has been used for the ven. sensitive and selective analysis of very low levels of mercury. A detection limit lower than lo-" hl (<02 ppt) was obtained applying anodic stripping voltammetry (AS\.). The parameters that governed the sensitivity and possible interferences by other ions have been examined in detail. The electrode has been successfully applied for determining mercury in seawater, wastewater! and also in human saliva and amniotic fluid. The modified electrode exhibited high stability and, therefore. could be used repeatedly without mechanical regeneration.

show abstract

The reliable determination of mercury traces in sea water by subtractive differential pulse voltammetry at the twin gold electrode

Cited by 78 publications

References 29 publications

Determination of Trace Mercury in Saltwaters at Screen-Printed Electrodes Modified with Sumichelate Q10R

Determination of Trace Mercury in Saltwaters at Screen-Printed Electrodes Modified with Sumichelate Q10R

Determination of mercury in biological fluids by potentiometric stripping analysis

Electrochemical determination of ultralow levels (<10⁻¹² M) of mercury by anodic stripping voltammetry using a chemically modified electrode

Contact Info

Product

Resources

About

The reliable determination of mercury traces in sea water by subtractive differential pulse voltammetry at the twin gold electrode

Cited by 78 publications

References 29 publications

Determination of Trace Mercury in Saltwaters at Screen-Printed Electrodes Modified with Sumichelate Q10R

Determination of Trace Mercury in Saltwaters at Screen-Printed Electrodes Modified with Sumichelate Q10R

Determination of mercury in biological fluids by potentiometric stripping analysis

Electrochemical determination of ultralow levels (<10−12 M) of mercury by anodic stripping voltammetry using a chemically modified electrode

Contact Info

Product

Resources

About

Electrochemical determination of ultralow levels (<10⁻¹² M) of mercury by anodic stripping voltammetry using a chemically modified electrode