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《Chinese Journal of Analytical Chemistry》 1983-07
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A Good PVC Matrix Membrane Picrate Ion-selective Electrode

Pan Jinghao He Mingwei Liu Yanmin (Department of Chemistry,Shanxi University)  
A PVC matrix membrane picrate ion-selective electrode based on ethyl violet picrate ion-pair is prepared.Its performance measured are of good quality.The electrode exhibits Nernstian response for picrate ion with a slope of 56—57mV/ decade(19℃)over the concentration range 1×10~(-2)—2×10~(-7)M at pH of 2.5 to12.3. The practical response time takes less than 15 seconds(10~(-6)M)and about 40 seconds(10~(-6)M).The electrode resistance is about 10~7 ohm.The lifetime of the electrode is longer than three months.The potential variation during 4 hours in 10~(-3)M picrate solution is±1.2 mV.The potentiometric selectivity coefficients for 32 various coexisting anions have been evaluated by means of the fixed interference method,and they are less than 1×10~(-2) except those of MnO_4~- and 2,6-dinitrophenol.The relatiohship between the potentiometric selectivity coefficient and the ratio of corresponding anion charge to thermochemical radius of the coexisting anion obeys the expression reported in the literature.
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