Highly Sensitive Differential Pulse Voltammetric Determination of Cd, Zn and Pb Ions in Water Samples Using Stable Carbon-Based Mercury Thin-Film Electrode

by Ensafi, Ali Asghar; Nazari, Zahra; Fritsch, Ingrid

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A new carbon-based mercury thin-film electrode consisting of screen-printed carbon on a low temperature co-fired ceramic substrate was made. Ex-situ mercury deposition in a potassium thiocyanate solution was used. This approach an electrode with high long-term stability (> 500 measurement cycles) and reproducibility (<= 2%) for sensitive determination of ultra trace heavy metals, using differential pulse anodic stripping voltammetry. The detection limits were 0.25, 0.08 and 5.5 ng mL(-1) for Cd(II), Pb(II), and Zn(II), respectively. The method was applied to the determination of the analytes in water, wastewater, lake water, and certified reference material samples with satisfactory results.

Journal
Electroanalysis
Volume
22
Issue
21
Year
2010
Start Page
2551
ISBN/ISSN
1040-0397
DOI
10.1002/elan.201000246