Simultaneous Trace Metal Analysis in Seawater by Linear Sweep Anodic Stripping Voltammetry

Authors

  • Jose B. Solis Institute of Chemistry, University of the Philippines, Diliman, Quezon City
  • Cherrie B. Pascual Institute of Chemistry, University of the Philippines, Diliman, Quezon City

DOI:

https://doi.org/10.26534/kimika.v13i2.85-89

Keywords:

linear sweep anodic stripping voltammetry, trace metals, seawater, rotating gold disc electrode, mercury thin-film electrode

Abstract

Voltammetric methods for trace metal analysis of seawater were developed using the linear sweep anodic stripping voltammetry (LSASV). A rotating gold disc electrode was used for the simultaneous determination ofCu(ll) and Hg(ll), while a mercury thin-film (in situ) on a rotating glassy carbon disc electrode was employed for the determination of Cd(ll), Pb(ll), and Zn(ll) in acetate buffers.

Stripping peak potentials observed at +0.51 V, +0.28 V, -0.47 V, -0.65 V, and -1.04 V (vs SCE) for Hg(ll), Cu(ll), Pb(ll), Cd(ll) and Zn(ll), respectively, were used for quantitative analysis. The following limits of detection were obtained: 0.04 µg/L for Cd(ll), 0.05 µg/L for Pb(ll), 0.11 µg/L for Zn(ll), 0.15 µg/L for Cu(ll), and 0.13 µg/L for Hg(ll). Linear responses were observed for the trace metals determined in the mg/L range with correlation factors of 0.997 or better. Analytical precision within the concentration levels of µg/L were less than 10% rsd.

This voltammetric method was applied to some water samples taken from the Manila Bay with the following results for total metal analysis: Cu, 0.61-1.08 µg/L; Hg, 0.42-3.06 µg/L; Cd, 0.53-0. 78 µg/L; Pb, 0.85-2.16 µg/L; and Zn, 3.63-4.00 µg/L.

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How to Cite

Solis, J. B., & Pascual, C. B. (1997). Simultaneous Trace Metal Analysis in Seawater by Linear Sweep Anodic Stripping Voltammetry. KIMIKA, 13(2), 85–89. https://doi.org/10.26534/kimika.v13i2.85-89

Issue

Vol. 13 No. 2 (1997)

Section

Research Articles

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