Abstract
A method is presented for trace-element analysis of lead and zinc by potentiometric stripping analysis (PSA) where both the glassy-carbon working electrode and the electrolyte are free of mercury. Analysis of zinc requires an activation of the glassy-carbon electrode. The activation is performed by pre-concentrating zinc on glassy carbon at -1400 mV(SCE) in a mercury-free electrolyte containing 0.1 M HCl and 2 ppm Zn2+, followed by stripping at approx. -1050 mV. A linear relationship between stripping peak areas, recorded in the derivative mode, and concentration was found in the range 0- 2000 ppb.
Original language | English |
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Journal | Analytical Letters |
Volume | 30 |
Issue number | 5 |
Pages (from-to) | 1001-1012 |
ISSN | 0003-2719 |
DOIs | |
Publication status | Published - 1997 |
Keywords
- Trace-metal analysis
- Potentiometric stripping analysis
- Electrochemistry