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A photo‐cured calcium ion‐selective electrode for use in flow injection potentiometry that tolerates high perchlorate levels
Author(s) -
Dimitrakopoulos Telis,
Farrell John R.,
Iles Peter J.
Publication year - 1996
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.1140080417
Subject(s) - calcium , chemistry , ionophore , ion selective electrode , perchlorate , inorganic chemistry , electrode , flow injection analysis , potassium , perchloric acid , analytical chemistry (journal) , nuclear chemistry , ion , selectivity , chromatography , detection limit , organic chemistry , catalysis
An improved photo‐cured membrane selective to calcium was developed based on the calcium bis[4‐(l, 1,3,3‐tetramethylbutyl)phenyl] phosphate ionophore and incorporates the lipophilic additive, potassium tetrakis( p ‐chloropheny1)borate. The calcium electrode exhibited a hyper‐Nernstian response of 31.0 mV change per activity decade and a log‐linear range between 1 × 10 −5 to 0.1 M in pure calcium chloride solution, in steady‐state mode. The calcium electrode was fast responding, reaching 90% of steady‐state value in 5s making it ideal for flow injection measurements. The photo‐cured electrode can measure calcium in a high perchlorate background, and was used to determine the total calcium level in full cream milk that was digested by a nitric/perchloric acid mixture. The results obtained were in good agreement with atomic absorption spectroscopy measurements.