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Accuracy and choice of procedures in 24-hour oesophageal pH monitoring with monocrystalline antimony electrodes.
Linköpings universitet, Institutionen för medicinsk teknik, Fysiologisk mätteknik. Linköpings universitet, Tekniska högskolan.
1986 (Engelska)Ingår i: Medical and Biological Engineering and Computing, ISSN 0140-0118, E-ISSN 1741-0444, Vol. 24, nr 6, s. 602-608Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In 24 h pH monitoring, the evaluation is dependent on the absolute accuracy of the pH measurements. Several sources of error exist, such as the chemical composition of calibration buffers and reference electrode gel and the effect of temperature on both the pH and the reference electrodes. We investigated the magnitude of these errors for the monocrystalline antimony electrode. Similar analysis applies to other types of pH electrodes. The errors we found are important when choosing a calibration procedure. We recommend a calibration procedure in which the pH and reference electrodes are both put in a beaker with the calibration buffers prior to and after the 24 h measurements. The calibration buffers and the electrode gel should have a specially selected ion composition where, for example, the Cl-ion concentration is critical. Corrections for differences in temperature between the calibration and the in situ measurements must be added. The pH measurements can be checked by performing in situ calibration.

Ort, förlag, år, upplaga, sidor
1986. Vol. 24, nr 6, s. 602-608
Nationell ämneskategori
Oorganisk kemi
Identifikatorer
URN: urn:nbn:se:liu:diva-116890DOI: 10.1007/BF02446263PubMedID: 3657317OAI: oai:DiVA.org:liu-116890DiVA, id: diva2:801406
Tillgänglig från: 2015-04-09 Skapad: 2015-04-09 Senast uppdaterad: 2017-12-04

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