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Potentiometric Cd2+-selective electrode with a detection limit in the low ppt range

Authors
Journal
Analytica Chimica Acta
0003-2670
Publisher
Elsevier
Publication Date
Volume
440
Issue
2
Identifiers
DOI: 10.1016/s0003-2670(01)01052-2
Keywords
  • Cd2+-Selective Electrode
  • Ion-Selective Electrodes
  • Potentiometry
  • Low Detection Limits
  • Trace Level Analysis

Abstract

Abstract A recently introduced model describing the response curves of polymer membrane ion-selective electrodes (ISEs) is used here to optimize a Cd 2+-ISE with a view to achieve very low detection limits. In a first step, the selectivity behavior is determined for two membranes based on the ionophore, N, N, N′, N′-tetradodecyl-3,6-dioxaoctanedithioamide (ETH 5435), but having different concentrations of the ionophore and ion-exchanger. Based on these data, the optimal response curves are calculated with a model that takes into account the ion fluxes induced by interfering ions. The experimental results with different ionic backgrounds correspond very well with the predicted effects. The best lower detection limit of 10 −10 M or 11 ppt Cd 2+ is achieved at pH 7 with an ionic background of 10 −4 M NaNO 3.

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