Determination of molybdenum in soils and plants using the polarographic adsorptive complex catalytic wave of Mo(VI)-cupferron

Jiao, Kui; Jin, Wenrui; Metzner, Helmut

doi:10.1016/0003-2670(92)80123-o

Cited by 45 publications

(16 citation statements)

References 5 publications

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“…On the other hand, the major interference of copper in the determination of zinc is in anodic stripping voltammetry system and our method is free of copper interference [17]. The ligand N-nitroso-N-phenylhydroxylamine (cupferron) has previously been used for the determination of aluminum [21,25], chromium [19], molybdenum [34], uranium [18], vanadium [35] and europium [22]. It also employed to develop the methods for simultaneous determinations of metal ions (for example see [29]) by ACSV.…”

Section: Doi: 101002/elan201000359mentioning

confidence: 99%

Ultrasensitive Simultaneous Quantification of Nanomolar Level of Cd and Zn by Cathodic Adsorptive Stripping Voltammetry in Some Real Samples

2010

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A novel, simple and sensitive adsorptive stripping voltammetry method was developed for simultaneous determination of Cd and Zn using N-Nitrozo-N-phenylhydroxylamine (Cupferron) as a selective complexing agent. Cadmium and zinc metals gave peaks that were distinctly separated by 450-1200 mV, allowing their determination over a wide range of concentrations. The influence of pH and the nature of supporting electrolytes, concentration of ligand, preconcentration time and applied potential were investigated. The detection limits were 0.058 ng/mL for Zn and 0.092 ng/mL for Cd, and the RSD at a concentration level of 50 ppb, were 1.8-2.1 % for both zinc and cadmium, respectively. The method was applied to the determination of cadmium and zinc in blood, drug, food and water samples with the satisfactory results. Zinc is a metal of prime environmental concern. Cadmium is among the toxic metal of significance for environmental surveillance, food control and occupational medicine, toxicology and hygiene. To study the environmental problems and environmental control, simple and sufficiently sensitive methods for the determination of these and other metals are necessary. A few methods allow the simultaneous determination of metals in real samples, mainly voltammetric methods [1-6] and chromatographic method [7]. For the simultaneous determination of trace elements in real samples, (foods samples, drug samples, water, etc.), voltammetric techniques are very suitable owing to their high sensitivity and relative simplicity and because only very simple pretreatment of the sample is required [8]. Stripping electrochemical techniques such as anodic stripping voltammetry (ASV) and potentiometric stripping analysis (PSA) can be used to simultaneously measure Cd and Zn in solution. These techniques combine low maintenance costs with high sensitivity and selectivity that allows the determination of low levels of metals without prior treatment of the sample. Linear-scan ASV has been applied to the direct determination of toxic metals in untreated solutions of sugar and PSA has been used for metal determinations in digested solutions of oils, tea and sugar [5].The applications of adsorptive stripping voltammetry (AdSV) in the determination of trace and ultratrace metals have been reviewed elsewhere [9]. One of the future trends in AdSV is multi-element analysis and two or three metals can be determined in a single scan owing to the metal specificity of the ligands. The advantages and disadvantages of advanced electroanalytical techniques versus AAS, ICP-AES and ICP-MS in environmental analysis have been reviewed elsewhere [10]. Recently several analytical techniques such as flame atomic absorption spectroscopy [11], inductively coupled plasma mass spectrometry [12] with ultra sensitive detection limits are reported for quantification of zinc and cadmium. However maintains and operational costs of these techniques are expensive and require adequate expertise. Therefore, the analysis is often limited to laboratory level. Since rel...

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Section: Doi: 101002/elan201000359mentioning

confidence: 99%

Ultrasensitive Simultaneous Quantification of Nanomolar Level of Cd and Zn by Cathodic Adsorptive Stripping Voltammetry in Some Real Samples

2010

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“…Surface catalytic redox reactions are important because they provide the possibility to improve the sensitivity of electroanalytical methods [25,26,27,28,29,30]. Moreover, these electrode reactions are widely exploited for the development of amperometric sensors [31,32,33].…”

Section: Introductionmentioning

confidence: 99%

The surface catalytic mechanism: a comparative study with square-wave and staircase cyclic voltammetry

Mirčeski

Gulaboski

2003

J Solid State Electrochem

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A pseudo-first-order catalytic mechanism in which both reactant and product of a redox reaction are strongly immobilized on an electrode surface is theoretically analysed under conditions of square-wave (SWV) and staircase cyclic voltammetry (SCV). A mathematical procedure is developed under diffusionless conditions. The relationships between the properties of the voltammetric response and both the kinetic parameters of the redox reaction and the parameters of the excitation signal are studied. The phenomenon of the quasi-reversible maximum is discussed. A comparative study between SWV and SCV is presented and the limitations and advantages of both techniques, from analytical and kinetic points of view, are discussed. The theoretical predictions are experimentally confirmed by the redox reaction of azobenzene in the presence of hydrogen peroxide as an oxidizing agent.

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“…The reaction of NO À 3 ions with Mo(V) and Mo(III) described by Johnson and Robinson [20] found wide application in the polarographic determination of molybdenum traces [21 -25] discussed in detail by Turyan and Ruvinsky [26]. Other ligands, such as cupferron [27], 8-hydroxyquinoline [28] and 2-methyl-8-quinolinol [29] were also utilized in catalytic polarography for the determination of trace molybdenum.…”

Section: Introductionmentioning

confidence: 99%

Sensitive Differential Pulse Polarographic Determination of Molybdenum Using The New Catalytic System Mo(VI)‐Phenantroline‐Chlorate

2007

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It was found that in acidic chloride media the complex of Mo(VI) with 1,10-phenantroline induces catalytic reduction of KClO 3 . This catalytic effect can be utilized for sensitive differential pulse polarographic determination of Mo(VI) with a low detection limit of 2.9 Â 10 À11 M (2.8 ng/L). The optimal Mo(VI) response was obtained at pH 2.8, in the presence of (6 -12) Â 10 À5 M 1,10-phenantroline and 2 Â 10 À2 M KClO 3 . The sensitivity was 1.73 nA/nM and the catalytic response was linear up to 7.5 Â 10 À7 M Mo (VI). The interferences from inorganic ions and surface-active substances were investigated. The results of the determination of Mo(VI) in CRM water sample showed good reproducibility (R.S.D. for standard solution is below 1.2% and for water samples is 8.9%) and accuracy of the elaborated catalytic polarographic method.

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Determination of molybdenum in soils and plants using the polarographic adsorptive complex catalytic wave of Mo(VI)-cupferron

Cited by 45 publications

References 5 publications

Ultrasensitive Simultaneous Quantification of Nanomolar Level of Cd and Zn by Cathodic Adsorptive Stripping Voltammetry in Some Real Samples

Ultrasensitive Simultaneous Quantification of Nanomolar Level of Cd and Zn by Cathodic Adsorptive Stripping Voltammetry in Some Real Samples

The surface catalytic mechanism: a comparative study with square-wave and staircase cyclic voltammetry

Sensitive Differential Pulse Polarographic Determination of Molybdenum Using The New Catalytic System Mo(VI)‐Phenantroline‐Chlorate

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