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A comparison of boron-doped diamond thin-film and Hg-coated glassy carbon electrodes for anodic stripping voltammetric determination of heavy metal ions in aqueous media.
Anal Chim Acta. 2006 Aug 11; 575(2):180-9.AC

Abstract

The performance of boron-doped diamond (BDD) for the anodic stripping voltammetric (ASV) determination of heavy metal ions (Zn2+, Cd2+, Pb2+, Cu2+, Ag+) was compared with that of Hg-coated glassy carbon (Hg-GC). Hg has historically been the electrode of choice for ASV but there is an ongoing search for alternate electrodes and diamond is one of these. Despite the fundamentally different nature of the metal reduction and oxidation reactions on these two electrodes, BDD provides as good or superior analytical detection figures of merit when compared to Hg. The stripping peak potentials for all the metals studied were similar at both electrodes indicating that BDD is as active as Hg for metal phase formation and oxidation. Due to the more heterogeneous chemical and electrical properties across the BDD surface, the stripping peaks were broader and more asymmetric than they were for Hg-GC. The linear dynamic range for BDD was three to four orders of magnitude (r2>0.995), similar to Hg-GC, but the sensitivity for BDD was three to five times lower. However, the lower background current and noise for BDD enabled detection limits as low as those seen for Hg-GC. The minimum concentration of each metal ion detectable (S/N> or =3) with BDD was in the mid to low ppb range (e.g., 50 ppb Zn2+, 1.0 ppb Cd2+, 5.0 ppb Pb2+, 10 ppb Cu2+ and 1.0 ppb Ag+). BDD exhibited an electrode-to-electrode and run-to-run variability of less than 5%, which is comparable to that for Hg-GC. The possibility of incomplete metal oxidation and metal phase detachment from BDD was investigated using double step chronoamperometry. Neither of these processes was found to occur to any appreciable extent. The results demonstrate that BDD is a viable alternate electrode to Hg for ASV.

Authors+Show Affiliations

Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA.No affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17723589

Citation

McGaw, Elizabeth A., and Greg M. Swain. "A Comparison of Boron-doped Diamond Thin-film and Hg-coated Glassy Carbon Electrodes for Anodic Stripping Voltammetric Determination of Heavy Metal Ions in Aqueous Media." Analytica Chimica Acta, vol. 575, no. 2, 2006, pp. 180-9.
McGaw EA, Swain GM. A comparison of boron-doped diamond thin-film and Hg-coated glassy carbon electrodes for anodic stripping voltammetric determination of heavy metal ions in aqueous media. Anal Chim Acta. 2006;575(2):180-9.
McGaw, E. A., & Swain, G. M. (2006). A comparison of boron-doped diamond thin-film and Hg-coated glassy carbon electrodes for anodic stripping voltammetric determination of heavy metal ions in aqueous media. Analytica Chimica Acta, 575(2), 180-9.
McGaw EA, Swain GM. A Comparison of Boron-doped Diamond Thin-film and Hg-coated Glassy Carbon Electrodes for Anodic Stripping Voltammetric Determination of Heavy Metal Ions in Aqueous Media. Anal Chim Acta. 2006 Aug 11;575(2):180-9. PubMed PMID: 17723589.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A comparison of boron-doped diamond thin-film and Hg-coated glassy carbon electrodes for anodic stripping voltammetric determination of heavy metal ions in aqueous media. AU - McGaw,Elizabeth A, AU - Swain,Greg M, Y1 - 2006/06/06/ PY - 2006/02/06/received PY - 2006/05/26/revised PY - 2006/05/30/accepted PY - 2007/8/29/pubmed PY - 2007/8/29/medline PY - 2007/8/29/entrez SP - 180 EP - 9 JF - Analytica chimica acta JO - Anal Chim Acta VL - 575 IS - 2 N2 - The performance of boron-doped diamond (BDD) for the anodic stripping voltammetric (ASV) determination of heavy metal ions (Zn2+, Cd2+, Pb2+, Cu2+, Ag+) was compared with that of Hg-coated glassy carbon (Hg-GC). Hg has historically been the electrode of choice for ASV but there is an ongoing search for alternate electrodes and diamond is one of these. Despite the fundamentally different nature of the metal reduction and oxidation reactions on these two electrodes, BDD provides as good or superior analytical detection figures of merit when compared to Hg. The stripping peak potentials for all the metals studied were similar at both electrodes indicating that BDD is as active as Hg for metal phase formation and oxidation. Due to the more heterogeneous chemical and electrical properties across the BDD surface, the stripping peaks were broader and more asymmetric than they were for Hg-GC. The linear dynamic range for BDD was three to four orders of magnitude (r2>0.995), similar to Hg-GC, but the sensitivity for BDD was three to five times lower. However, the lower background current and noise for BDD enabled detection limits as low as those seen for Hg-GC. The minimum concentration of each metal ion detectable (S/N> or =3) with BDD was in the mid to low ppb range (e.g., 50 ppb Zn2+, 1.0 ppb Cd2+, 5.0 ppb Pb2+, 10 ppb Cu2+ and 1.0 ppb Ag+). BDD exhibited an electrode-to-electrode and run-to-run variability of less than 5%, which is comparable to that for Hg-GC. The possibility of incomplete metal oxidation and metal phase detachment from BDD was investigated using double step chronoamperometry. Neither of these processes was found to occur to any appreciable extent. The results demonstrate that BDD is a viable alternate electrode to Hg for ASV. SN - 1873-4324 UR - https://www.unboundmedicine.com/medline/citation/17723589/A_comparison_of_boron_doped_diamond_thin_film_and_Hg_coated_glassy_carbon_electrodes_for_anodic_stripping_voltammetric_determination_of_heavy_metal_ions_in_aqueous_media_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0003-2670(06)01180-9 DB - PRIME DP - Unbound Medicine ER -
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