Determination of Manganese by Cathodic Stripping Voltammetry on a Microfabricated Platinum Thin–film Electrode

Electroanalysis - Tập 29 Số 3 - Trang 686-695 - 2017
Wenjing Kang1, Cory A. Rusinek2, Adam Bange3, Erin N. Haynes4, William R. Heineman2, Ian Papautsky5
1Department of Electrical Engineering and Computing Systems, University of Cincinnati, Cincinnati, OH, 45221-0030
2Department of Chemistry, University of Cincinnati, Cincinnati, OH 45221-0172
3Department of Chemistry, Xavier University, Cincinnati, OH, 45207-4221
4Department of Environmental Health, University of Cincinnati, Cincinnati, OH, 45267-0056
5Department of Bioengineering, University of Illinois at Chicago, 851 S Morgan St, SEO 218, Chicago, IL, 60607

Tóm tắt

Abstract

In this work, we report on the determination of trace manganese (Mn) using cathodic stripping voltammetry (CSV) using a microfabricated sensor with a Pt thin‐film working electrode. While an essential trace metal for human health, prolonged exposure to Mn tends to gradually impair our neurological system. The potential sources of Mn exposure make it necessary to monitor the concentration in various sample matrices. Previous work by us and others suggested CSV as an effective method for measuring trace Mn. The analytical performance metrics were characterized and optimized, leading to a calculated limit of detection (LOD) of 16.3 nM (0.9 ppb) in pH 5.5, 0.2 M acetate buffer. Further, we successfully validated Mn determination in surface water with ∼90% accuracy and >97% precision as compared with inductively coupled plasma mass spectrometry (ICP‐MS) “gold standard” measurement. Ultimately, with stable, accurate and precise electrochemical performance, this Pt sensor permits rapid monitoring of Mn in environmental samples, and could potentially be used for point‐of‐use measurements if coupled with portable instrumentation.

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Electroanalysis

Tập 29 Số 3

686-695

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