Polarographic cobalt determination in the presence of high zinc concentrations

Schmidt, Thomas; Geißler, Manfred; Werner, Gerhard; Emons, Hendrik

doi:10.1007/bf00467697

Cited by 10 publications

(1 citation statement)

References 9 publications

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“…However, a large excess of Zn or Ni interferes in the Co determination due to overlapping of the Co and Zn or Co and Ni waves [5 -8]. Some methods have been proposed of reducing of Zn influence on the Co determination by the complexation of Zn [5 -9], selective inhibition of Zn reduction in the presence of surface active substances [10,11] or by application of matrix exchange procedure [12,13]. In the seldom applied procedures the DMG was replaced by other dioximes such as cyclohexanedione dioxime [14 -16] or abenzil dioxime [17 -19], the complex of which with Co was reduced some tenths millivolts at more positive potentials then Co-DMG complex.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Adsorptive Stripping Voltammetric Determination of Cobalt and Nickel as Their α‐Furil Dioxime Complexes

Bobrowski

2004

Electroanalysis

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The exploitation of the catalytic-adsorptive effect in the Co(II)-dioxime-nitrite systems provides a significant increase of the Co adsorptive stripping voltammetric response and subsequently the influence of the interfering elements such as Ni and Zn is strongly diminished. The purpose of the present paper was to study voltammetric properties of Co and Ni in a supporting electrolyte containing ammonia buffer, a-furil dioxime in the absence and in the presence of nitrite, by differential pulse polarography and adsorptive stripping voltammetry. Results of detailed studies aimed at optimizing the analytical parameters for simultaneous catalytic adsorptive stripping voltammetric determination of Co and Ni in the form of complexes with a-furil dioxime in the presence of Zn matrix are presented. In the supporting electrolyte of composition 0.1 M NH 4 Cl, 0.5 M NH 3 , 4 Â 10 À5 M aFD, 0.5 M NaNO 2 the linearity range amounts from 0.03 to 2.4 mg/L for Co and from 0.3 to 9 mg/L for Ni for 20 s of accumulation. The method enables the determination of Co and Ni in the presence of a great excess of Zn with the detection limit equal to 0.02 mg/L Co and 0.2 mg/L Ni obtained for a 20 s accumulation time.

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Section: Introductionmentioning

confidence: 99%

Catalytic Adsorptive Stripping Voltammetric Determination of Cobalt and Nickel as Their α‐Furil Dioxime Complexes

Bobrowski

2004

Electroanalysis

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Catalytic adsorptive stripping voltammetric determination of cobalt as an α‐benzil dioxime complex in the presence of an extremely large excess of zinc

Bobrowski

Bond

1991

Electroanalysis

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There is considerable interest in determining trace amounts of cobalt in highly concentrated zinc solutions. Existing commonly used voltammetric methods such as those based on formation of dimethylglyoxime complexes and adsorptive stripping voltammetry, while very sensitive for the determination of cobalt, do not always provide the necessary discrimination against the zinc (and nickel) processes. In the present work a recently described method, based on the formation and adsor tion of a cobalt-abenzil dioxime complex and catalyzed by nitrite, has been optimized so that a 10 to lo7 M concentration excess of zinc can be tolerated. Since the method is also relatively insensitive to nickel, it can be applied to highly purified zinc electrolytes.

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Elektrochemische Detektion in Fließsystemen

Ernons

Jokuszies

1988

Zeitschrift fuer Chemie

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In the review principles and analytical applications of conductometric, potentiometric, voltammetric and coulometric detection in streaming solutions are described, with the emphasis on dynamic interfacial techniques. Sensitivity, detection limit, linear dynamic range, response time, selectivity and stability are discussed. Favourable detector cell designs are described focussing on hydrodynamic, electrochemical and stability characteristics. Practical applications of amperometric detectors are summarized. Finally most recent developments and further trends in detector research are outlined.

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Polarographic cobalt determination in the presence of high zinc concentrations

Cited by 10 publications

References 9 publications

Catalytic Adsorptive Stripping Voltammetric Determination of Cobalt and Nickel as Their α‐Furil Dioxime Complexes

Catalytic Adsorptive Stripping Voltammetric Determination of Cobalt and Nickel as Their α‐Furil Dioxime Complexes

Catalytic adsorptive stripping voltammetric determination of cobalt as an α‐benzil dioxime complex in the presence of an extremely large excess of zinc

Elektrochemische Detektion in Fließsystemen

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