Direct determination of bismuth(III) in sea water by square-wave anodic stripping voltammetry at a glassy-carbon rotating-disk electrode
✍ Scribed by Šebojka Komorsky-Lovrić
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 463 KB
- Volume
- 204
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
A method for the determination of bismuth (III) in untreated sea water at its natural pH of 8.1 IS described. A bare glassy-carbon rotating-disk electrode is preconditioned by placing in the sample at an applied potential of -0.8 V vs. Ag/AgCl for 20 min; after stripping to -0.4 V, bismuth is accumulated for 5 mm at -0.8 V and finally stripped in the square-wave mode. The bismuth peak appears at ca. + 0.10 V vs. Ag/AgCh peak height is linearly related to concentration up to 2 x 10-i" mol dm-". The method is highly selective for bismuth. The concentration of Bi (III) in the investigated sample was (6 & 1) X lo-" mol dme3, or 12 + 2 ng dmm3. The different types of response obtained are discussed.