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Flow‐Injection Amperometric Detection with Solvent Polymeric Membrane Ion Sensors
Author(s) -
Ortuño Joaquín A.,
Hernández Jorge,
SánchezPedreño Concepción
Publication year - 2004
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.200302886
Subject(s) - tetraphenylborate , amperometry , analytical chemistry (journal) , potentiostat , repeatability , chemistry , chromatography , vinyl chloride , membrane , electrode , ion , materials science , electrochemistry , polymer , biochemistry , organic chemistry , copolymer
An amperometric detector for hydrophobic ions based on a plasticized poly(vinyl) chloride (PVC) membrane incorporated in a flow‐injection system was developed. A four‐electrode potentiostat with ohmic drop compensation was used, while a flow‐through cell incorporated the four electrodes and the membrane, which contained tetrabutylammonium tetraphenylborate. When the influence of the applied potential and of the flow‐injection variables on the determination of tetrabutylammonium was studied, a linear relationship was observed between current peak height and ion concentration over a range of 5×10 −6 –6×10 −5 M tetrabutylammonium. Good repeatability and between‐day reproducibility and high sample frequency were obtained. The effect of other ions was studied. Two different amperometric methods, indirect and direct, were also developed for the determination of dodecylsulfate in the concentration range 3×10 −5 –9×10 −4 M.