Acetic Acid Release from Polymeric Membrane pH Electrodes for Generating Local pH Gradients at Ion-Selective Membranes
Open Access
- 1 January 1999
- journal article
- Published by The Electrochemical Society in Electrochemical and Solid-State Letters
- Vol. 1 (4) , 194-196
- https://doi.org/10.1149/1.1390682
Abstract
High levels of acetic acid in the backfilling solution of ion‐selective electrodes lead to rapid acid transport across polymer membranes into the sample. This generates an elevated acid concentration at the membrane surface which can be measured by using a pH‐responsive membrane. It is shown that the phase boundary pH may be significantly different than in the bulk, even in well‐buffered samples. This opens up new design possibilities for ion sensors. pH response profiles for different inner electrolyte compositions are shown, as well as long‐term drift profiles upon introduction of acetic acid to one side of the membrane. ©1998 The Electrochemical SocietyKeywords
This publication has 0 references indexed in Scilit: