Highly sensitive and selective measurements of lead by stripping voltammetry/potentiometry following adsorptive accumulation of the lead-o-cresolphthalexon complex
✍ Scribed by Joseph Wang; Jianmin Lu; Chaim Yarnitzky
- Book ID
- 102984187
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 630 KB
- Volume
- 280
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
A very sensitive and selective stripping procedure for trace measurements of lead, based on the adsorptive accumulation of the lead-o-cresolphthalexon (OCP) complex onto various mercury electrodes is described. The technique offers enhanced sensitivity over analogous stripping measurements of lead (with a detection limit of 40 ng 1-i after 2 min accumulation). Even more significant is the improved selectivity in the presence of a large excess of thallium or tin (which commonly interfere in anodic stripping measurements). Both voltammetric and potentiometric stripping modes can be employed to probe the reduction of the lead-OCP complex. The reported coupling of the new method with disposable screen-printed electrodes holds a great promise for decentralized testing of lead. Applicability to assays of drinking water is illustrated.