ISSN:
1741-0444
Keywords:
Antimony
;
Antimony oxide
;
Microelectrode
;
Oxygen sensitivity
;
pH
;
Recess
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
Notes:
Abstract It is desirable to reduce or eliminate the oxygen sensitivity of antimony pH microelectrodes in physiological applications because it is not possible to determine if changes in the electrode's EMF are associated with changes in pH or pO2. The oxygen sensitivity of electroplated antimony pH microelectrodes was experimentally determined for a factorial combination of (a) recessing the electrode tip, (b) saturating the medium with antimony axoide and (c) buffering the medium with phosphate. After establishing the baseline pH sensitivity in phosphate buffers, EMF was measured in a flow-through chamber using an electrometer, while the equilibrating gas was varied selectively from 5 per cent to 21 per cent oxygen. The investigation concluded that recessing the antimony pH microelectrode does not eliminate but does reduce the electrode's oxygen sensitivity. Saturating the medium with antimony oxide or buffering with phosphate do not reduce the oxygen sensitivity of the antimony pH microelectrode. Loss of electroplated antimony from the tip of the antimony pH microelectrode was associated with an increase in EMF.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02441923
Permalink
