Anodic stripping determination of lead and thallium at a bismuth film electrode after extraction of the respective bromide complexes into propylene carbonate
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Anodic stripping determination of lead and thallium at a bismuth film electrode after extraction of the respective bromide complexes into propylene carbonate
Zdrojový dokument:Sensing in electroanalysis. K. Kalcher, R. Metelka, I. Švancara, K. Vytřas (Eds.).2011, Volume 6.
Abstrakt:
In this contribution, anodic stripping voltammetric determination of lead(II)
and thallium(III) in organic solvent; namely, propylene carbonate, is reported
concerning a bismuth film electrode (BiFE) as the working electrode of choice. The
corresponding measurements were performed directly in organic phase after gas-stirred
liquid-liquid extraction from hydrochloric acid-based solution, confirming the
enhancement in both sensitivity and selectivity of metal determination when employing the methods used some decades ago and combining extraction with polarographic
principles. The metals of interest were determined either separately or simultaneously and for the detection of lead(II), the comparison between in-situ and ex-situ operated BIFEs had also been made and the respective differences discussed.