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Citation: Qi Deyao, Ying Tailin. FABRICATION OF PVC MATRIX MFMBRANE POTASSIUM ION-SELECTIVE MICROELECTRODE[J]. Chinese Journal of Applied Chemistry, ;1985, 2(1): 60-63. shu

FABRICATION OF PVC MATRIX MFMBRANE POTASSIUM ION-SELECTIVE MICROELECTRODE

Qi Deyao ,
Ying Tailin

1.
Analytical Chemistry Section, Shanghai University of Technology

Received Date: 10 August 1984
Available Online: 15 October 1984
Fund Project:

A potassium ion-selective microelectrode based on incorporating valinomycin in the PVC matrix membrane has been designed and constructed. It is a needle shaped electrode made of glass with a tip outer diameter of 5-10μm.The concentration calibration curve of the electrode is linear over concentration range of 1×10^-4-1×10^-1M of K⁺, with detection limit 2.0×10^-5MK⁺ and a slope 54 mV per decade. The working pH ranges 3-10. The selectivity coefficient K_K,Na^pot is 1.12×10^-4. The values of selectivity coefficients for some principal interferences, such as Li⁺, NH₄⁺, Ca²⁺, Ba²⁺, Mg²⁺, have also been determined. The electrode can be applied in studying physiological,biochemical and clinical phenomena related to K⁺ activties.
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