SoI--gel modification of pH electrode glass membranes for sensing anions and metal ions.
Anal Chem
; 73(7): 1605-9, 2001 Apr 01.
Article
in En
| MEDLINE
| ID: mdl-11321316
ABSTRACT
To obtain glass membrane electrodes selective for anions and metal ions, pH electrode glass membranes were modified by a sol-gel method using a quaternary ammonium salt and a bis(crown ether). A chloride ion-sensing glass membrane was designed, in which a pH electrode glass membrane was modified chemically by an alkoxysilyl quaternary ammonium chloride. X-ray photoelectron spectroscopy confirmed the chemical bonding of the quaternary ammonium moiety to the starting glass surface, which afforded the first example of glass-based "anion"-sensing membranes. A neutral carrier-type sodium ion-selective glass membrane was also fabricated which encapsulates a bis(12-crown-4) derivative in its sol-gel-derived surface. Both sol-gel-modified anion and metal ion-selective glass electrodes exhibited high sensitivity to their ion activity changes. The present sol-gel modification paves the way for designing glass-based ion sensors with tailor-made ion selectivities toward anions as well as cations.
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Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Anal Chem
Year:
2001
Document type:
Article
Affiliation country:
Japan