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Derivative dynamic response of ion-selective electrodes. Application to the precipitate-based iodide-selective electrode in the presence of interfering ions

✍ Scribed by Concepción Sánchez-Pedreño; Joaquin A. Ortuño; Maria del Carmen López

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
403 KB
Volume
315
Category
Article
ISSN
0003-2670

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✦ Synopsis

The concept of the derivative dynamic response (dE/dt) of ion-selective electrodes is introduced to study the response of a precipitate-based iodide-selective electrode in the presence of interfering ion, using a flow injection system and a flow-through cell. A type of concentration perturbation is assayed in which the primary ion is completely removed while the interfering ion is introduced. The effects of interfering ion concentration and flow rate on the derivative dynamic signals are studied. A new well-defined peak appears in the presence of bromide interfering ion. The peak height increases with bromide concentrations in the range of 10m5 to 10m2 M. In the case of chloride interfering ion the new peak is only appreciable at 2 10m2 M.

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✍ Young S. Kim; George M. Padilla 📂 Article 📅 1978 🏛 Elsevier Science 🌐 English ⚖ 429 KB

Experimentally determined free Ca ion concentrations, measured with a Caselective electrode, were compared with values calculated with a computer program utilizing stability constants of the chelating agents: NTA, EDTA, and EGTA used to set the free ion concentrations in the range of 10d3 to 10-O M.