Determination of Trace Aluminum by Anodic Adsorptive Stripping Voltammetry Using a Multi-Walled Carbon Nanotube Modified Carbon Paste Electrode

Abstract

The adsorptive voltammetric behavior of the aluminum (Al)-alizarin violet (AV) complex in 0.2 mol L⁻¹ HAc-NaAc buffer (pH 4.5) at a multi-walled carbon nanotube modified carbon paste electrode (MWCNT/CPE) was investigated. The results showed that the complex can be adsorbed on the surface of the MWCNT/CPE, yielding one oxidation peak at 530 mV (vs. SCE). The proposed method exhibits good linearity over the range from 1.0 × 10⁻⁹ mol L⁻¹ to 1.0 × 10⁻⁷ mol L⁻¹, and a low detection limit of 6.0 × 10⁻¹⁰ mol L^-1 for 120 s accumulation was obtained under optimum conditions.

Keywords:

• Alizarin violet
• Aluminum determination
• Anodic adsorptive stripping voltammetry
• Modified electrode
• Multi-walled carbon nanotubes

Acknowledgments

This work was supported by the Project of Science and Technology Department of Hunan Province (No. 2009FJ3158), the Project of Education Department of Hunan Province (Nos. 09C173 and 09K099), and the Construct Program of the Key Discipline in Hunan Province. This work was supported by the Project of Science and Technology Bureau of Hengyang City (No. 2010KJ21).

Notes

Note: Values in parentheses show the maximum no. of moles of foreign ion per moles of Al(III) which can be tolerated.

^a Differential pulse voltammetry.

^b Static mercury drop electrode.

^c Linear sweep voltammetry.

^d Hanging mercury drop electrode.

^e 1,2-dihydroxyanthraquinone-3-sulfonic acid (DASA).

^f Staircase voltammetry.

^g Square wave voltammetry.

^h Glassy carbon electrode.

ⁱ Osteryoung square wave stripping voltammetry.

^j Bismuth film electrode.

^k Screen printed electrode.

^l Multi-walled carbon nanotubes modified carbon paste electrode.