Abstract
An electrochemical flow cell suitable for use with dual detection by potentiometric stripping analysis and atomic absorption spectrometry in a flow-injection system is characterized by flow pattern and dispersion measurements. The deposition efficiency can be altered from 1–2% to 24% by using a glassy carbon and a carbon felt electrode, respectively. Application to the determination of lead in water showed that after enrichment on carbon felt the sensitivity for flame atomic absorption spectrometry is increased by an order in magnitude (enrichment factor ca 5 and 30 at sample frequencies of 60 and 12 h −1, respectively). Dual-detection allows certain errors appearing in one of the methods caused by, e.g., malfunction of the apparatus or wrong sample pretreatment, to be recognized, thus providing accuracy checks.
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