PMID: 6970290Jan 1, 1980Paper

Physicochemical characteristics of antimony microelectrode with special reference to selection of standard buffers

The Japanese Journal of Physiology
Y MatsumuraM Fujimoto

Abstract

1) Antimony (Sb) microelectrodes with tips of 2 to 5 micrometers in outside diameter were constructed, and their electromotive forces (EMF) were tested in response to the pH of several calibration buffers. The data were compared with those of glass pH electrodes. 2) Increasing ionic strength (I) caused a significant deviation in pH readings of the Sb-microelectrode (delta pHSb-Glass). The above salt effect was empirically given by delta pHSb-Glass = 0.017--0.125 I (I = 0.09--0.22) 3) Even with the correction for ionic strength, the values of delta pHSb-Glass were still dependent on the nature of calibration buffers employed. Among various buffers, Tris buffer [Tris(hydroxymethyl)-aminomethane, (THAM)] had the least disturbance on the Sb-microelectrode, and bicarbonate had also relatively minor effect. 4) The pH value according to the Sb-electrode was caused to deviate considerably by phosphate. The effect of phosphate within the range of 1 to 67 mM can be predicted by 1/delta pHSb-Glass = 1 + (0.174/[PO4]) 5) Like phosphates, BES [N, N-Bis (2-hydroxyethyl)-2-aminoethane sulfonic acid] also had a significant effect on the EMF of the Sb-microelectrode. 6) Upon consideration of the above facts, measurements of several biological f...Continue Reading

Citations

Jan 1, 1989·Critical Reviews in Analytical Chemistry·StanisŁAw GłabFolke Ingman

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