Construction and evaluation of a novel In(III) liquid ion-selective membrane electrode.
A liquid ion-selective membrane electrode containing a chloroform-acetonitrile (10:1) solution of the complex of In(III) with 1-benzyl-3-methyl-4-benzoyl-5-pyrazolone (PMBP) and diphenylguanidine is described. The basic electrode performance characteristics were evaluated according to IUPAC recommendations. The slope of the calibration graph (electrode potential v. concentration) was 18.7 mV (pIn)(-1) in the pIn range 4.5-1 (pH 6). Direct potentiometric determination of In(III) showed an average recovery of 99.1% with a standard deviation of 1.2%. The method is recommended for the precise direct potentiometric assay of In(III) in metals and minerals without a prior separation.
Li
C
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Department of Chemistry, Guizhou Normal University, Guiyang 550001, China.
Hou
J G
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