Construction and evaluation of ion-selective electrodes for potassium and calcium with a summing operational amplifier. Application to wine analysis

• Type: Article in International Scientific Journal
• Date: 1998

Authors

Perez Olmos, R (Author) Other; Rios, A (Author) Other; Lapa, RAS (Author) FFUP; Lima, JLFC (Author) FFUP

Journal

Title: Fresenius' Journal of Analytical Chemistry

Vol. 360

Pages: 659-663

ISSN: 0937-0633

Publisher: Springer

Indexing

ISI Web of Knowledge - 3 Citations

Scopus - 4 Citations

Other information

Authenticus ID: P-001-8BH

DOI: 10.1007/s002160050776

Abstract (EN): Electrodes selective to potassium and calcium with improved senstivity were constructed like conventional electrode (ISEs), but used an operational amplifier to sum the potentials supplied by the four membranes (ESOAs). The results obtained during the evaluation of their working characteristics were compared to those obtained by conventional ISEs and were found to be similar, but with higher precision. The electrodes were used in the potentiometric determination of potassium, calcium and magnesium in wines. The results given by ESOAs were more precise than those from ISEs. The results obtained by potentiometry were in good agreement with those from AES for potassium and AAS for calcium and magnesium.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5