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Voltammetric determination of manganese by using active glassy carbon electrode

Yifeng Tu

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Abstract

The determination of manganese(Ⅱ) by linear sweep voltammetry at pretreated glassy carbon (GC) electrode was investigated. The electrochemical oxidative process of Mn(Ⅱ) was catalyzed by MnO_2 deposited on the surface of the GC electrode. The sensitivity of the manganese determined by the voltammetry was greatly enhanced at active GC electrode. In 0.04 mol/L NH_3-NH_4Cl(pH 9.0)buffer solution, the anodic current was linearly proportional to the concentration of Mn(Ⅱ) in the range of 6.0×10~(-8)～1.0×10~(-5) mol/L. The detection limit was 4.0×10~(-8) mol/L. The relative standard deviation was 1.6% (n=9) at 3×10~(-7) mol/L level.

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What this paper is about

The determination of manganese(Ⅱ) by linear sweep voltammetry at pretreated glassy carbon (GC) electrode was investigated. The electrochemical oxidative process of Mn(Ⅱ) was catalyzed by MnO_2 deposited on the surface of the GC electrode. The sensitivity of the manganese determined by the voltammetry was greatly enhanced at active GC electrode. In 0.04 mol/L NH_3-NH_4Cl(pH 9.0)buffer solution, the anodic current was linearly proportional to the concentration of Mn(Ⅱ) in the range of 6.0×10~(-8)～1.0×10~(-5) mol/L. The detection limit was 4.0×10~(-8) mol/L. The relative standard deviation was 1.6% (n=9) at 3×10~(-7) mol/L level.

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Available abstract

The determination of manganese(Ⅱ) by linear sweep voltammetry at pretreated glassy carbon (GC) electrode was investigated. The electrochemical oxidative process of Mn(Ⅱ) was catalyzed by MnO_2 deposited on the surface of the GC electrode. The sensitivity of the manganese determined by the voltammetry was greatly enhanced at active GC electrode. In 0.04 mol/L NH_3-NH_4Cl(pH 9.0)buffer solution, the anodic current was linearly proportional to the concentration of Mn(Ⅱ) in the range of 6.0×10~(-8)～1.0×10~(-5) mol/L. The detection limit was 4.0×10~(-8) mol/L. The relative standard deviation was 1.6% (n=9) at 3×10~(-7) mol/L level.

Key concepts: Chemistry, Manganese, Detection limit, Glassy carbon, Cyclic voltammetry, Linear sweep voltammetry, Electrochemistry, Electrode

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