"Potentiometric Flow Analysis Device Using Membrane-coated Carbon-rod Ion-selective Electrode Detectors"
Anal. Chim. Acta
1992 Volume 261, Issue 1-2 Pages 399-404
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Enju Wang and Satsuo Kamata*
Abstract:
To prepare an ion-selective electrode for Cu2+, a carbon rod (7 cm x 4 mm) with a polished tip was coated with a composition containing (by wt.) 3% of tetraisobutylthiuram disulfide, 0.7% of K tetrakis-(4-chlorophenylborate), 63.1% of 2-nitrophenyl octyl ether (I) and 33.2% of PVC; for anions the composition contained 3.3% of propane-1,2-diylbis(diphenylphosphine), 66.7% of I and 30% of PVC. Either electrode was conditioned in 1 mM Cu2+ before use as detector in the PTFE cell of a simple flow system. For the determination of anions, the filtered and diluted sample (30 to 100 µL) was injected into 0.01 M NaH2PO4 as carrier. The peak potential of the electrode was rectilinearly related the log. concentration. of SCN-, ClO4-, NO3- or Cl- over approximately three decades of concentration. For Cu2+, a continuous-flow system was used with the sample stream buffered at pH 6 with 0.01 M acetate. The rectilinear pCu range was 2 to 5.5. Recoveries of Cu2+ or ClO4- were 97% at 50 µM. The flow injection method was successfully applied to the determination of Cl- in seawater and urine. The electrodes could be used continuously for 2 weeks; the carbon rod could then be cleaned and re-coated. A flow-through anal. system that utilizes a membrane-coated carbon rod ion-selective electrode was investigated. Electrodes for Cu2+ based on a thiuram disulfide neutral carrier and for ClO4-, SCN-, NO3- and Cl- based on a bis(diphenylphosphino)propane-copper complex as ion exchanger exhibited satisfactory performance in a continuous-flow system. The response of the anion electrodes in a flow injection system was near Nernstian in the concentration. range 10^-2-10-4 or 10^-5M. Highly reproducible measurements were obtained with sample volumes of 30-100 µL and a sample injection rate of up to 400 h-1. The chloride electrode was suitable for the FIA determination of Cl- in seawater and urine.
Chloride
Sea
Urine
Interferences
Apparatus
Detector
