Analytical Sciences
Online ISSN : 1348-2246
Print ISSN : 0910-6340
ISSN-L : 0910-6340
Flow-through Type Chloride Ion Selective Optodes Based on Lipophilic Organometallic Chloride Adducts and a Lipophilic Anionic Dye
Hideaki HISAMOTOKazuhiko WATANABEHitoshi OKAEriko NAKAGAWAUrsula E. SPICHIGERKoji SUZUKI
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JOURNAL FREE ACCESS

1994 Volume 10 Issue 4 Pages 615-622

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Abstract

Universitätstrasse 16, CH-8092 Zürich, Switzerland Flow-through type fiber-optic chloride ion selective optodes have been developed based on chloride adducts of lipophilic organometallic compounds, including a metal: Sn, Ge, Hg or Hf and a lipophilic anionic indicator dye of the diphenyl amine type. The pellicular-type ODS beads were coated with a lipophilic organic liquid containing the lipophilic organometallic compound as the anion-selective ionophore ligand and LAD-3 as the color changeable indicator dye. The optode system was constructed by packing these color changeable ion sensing beads in the flow-through optical cell (cell volume, 7μl) having a quartz window attached directly to the distal end of a bifurcated optical fiber. The optode based on tricyclohexyltin chloride (TCTCl) exhibited the most sensitive response to chloride ion among all the sensors using the organometallic compounds investigated. This optode could detect chloride ion in the concentration ranging from 10-4to 1M at pH 6.5 with a 0.01M sodium phosphate buffer as the flowing solution by measuring the absorbance change in the sensing beads at 516nm. This optode showed sufficient selectivity for the determination of chloride ion in normal human serum.

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© The Japan Society for Analytical Chemistry
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