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An X‐ray photoelectron spectroscopy investigation of silver iodide‐coated ion‐selective electrodes
Author(s) -
Strydom C. A.,
van Staden J. F.,
Strydom H. J.
Publication year - 1992
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140041009
Subject(s) - iodide , x ray photoelectron spectroscopy , ion , bromide , silver bromide , chloride , silver chloride , electrode , silver iodide , chemistry , inorganic chemistry , absorption (acoustics) , surface layer , analytical chemistry (journal) , layer (electronics) , materials science , silver halide , chemical engineering , organic chemistry , chromatography , engineering , composite material
The AgI‐coated ion‐selective electrode surface is more stable than either the AgCl or AgBr surfaces if exposed to solutions containing ions such as Cl − , Br − , I − , Ag + , and NH 3 for a week. A mixed AgCl s I 1− or AgBr s I 1−s phase is formed upon a week's treatment of the AgI surface with either Cl − or Br − , with S much smaller than 1. After a week's treatment with high concentrations of the ions, no new surface layer consisting of only AgCl or AgBr is formed, as was observed in the case of AgCl and AgBr electrodes. Although AgI is much less soluble than either AgCl or AgBr, the absorption of chloride and bromide ions into the AgI surface nevertheless increases with time.