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Detection limit of ion-selective bulk optodes and corresponding electrodes

✍ Scribed by Eric Bakker; Michael Willer; Ernö Pretsch

Book ID
102982854
Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
635 KB
Volume
282
Category
Article
ISSN
0003-2670

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✦ Synopsis

The detection limit of a highly selective Pb2+ -sensitive optode based on a solvent polymeric membrane phase is compared to the corresponding Pb*+ -electrode. For this purpose, a practical definition of the detection limit for optodes is presented. Whereas the optode phase has an incorporated Pb*+-selective ionophore and H+-selective chromoionophore, the ion-selective electrode has no chromoionophore, but otherwise equal composition. It is shown that both optode and electrode are responding to the free ion activity of Pb'+ in the sample, which may be buffered by the use of suitable ligands such as NTA and EDTA. The detection limit of the optode (10-13.1 M) has been found to be much lower than that of the electrode (10-9.2 MI, but with sample activities of less than 1O-11.5 M, response times of more than 60 h have been observed with EDTA as metal ion buffer. This is possibly due to a slow decomplexation step of the EDTA-Pb'+ complex.

📜 SIMILAR VOLUMES

Approaches to Improving the Lower Detect
Approaches to Improving the Lower Detection Limit of Polymeric Membrane Ion-Selective Electrodes
✍ Zsófia Szigeti; Tamás Vigassy; Eric Bakker; Ernö Pretsch 📂 Article 📅 2006 🏛 John Wiley and Sons 🌐 English ⚖ 244 KB

## Abstract More than ten different approaches for improving the lower detection limit of polymeric membrane ion‐selective electrodes have been suggested during the recent years. In this contribution, their principles are briefly summarized with a focus to their general practical applicability. The