Preparation and Application of Potassium Ion-Selective Membrane Electrode Based on Benzo-15-Crown-5 Ether

Author(s): Olcay Sendil, Erdal Pecenek, Guler Ekmekci, Guler Somer.

Journal Name: Current Analytical Chemistry

Volume 5 , Issue 1 , 2009

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A new potassium ion – selective membrane electrode has been developed based on crown ether. The membrane consisted of benzo-15-5 crown ether as a neutral carrier, orto-nitrophenylphenyl ether as plasticizer and PVC as membrane matrix. An analytically useful potential change occurs in the 1x10 – 6-1x10 – 2 mol L-1 concentration range. The slope of the linear portion (1x10-2 – 1x10-4 mol L-1) was 56 ± 3 mV/10-fold concentration changes in potassium concentration. In the presence of 1x10 – 3 mol L-1 potassium, no interference was observed for Li+, Na+, NH4 +, Mg2+, Ca2+, Sr2+, Ba2+, Cr3+, Mn2+, Fe3+, Co2+, Ni2+, Cu2+, Zn2+, F-, Br-, I-, NO2 -, SO4 2-, CO3 2-, S2- ions. The measurements were made at constant ionic strength (0.1 mol L-1 NaNO3, medium) and at room temperature. The lifetime of the electrode was approximately 2 months, and the response time was about 20-30 seconds. This electrode has been used for the determination of potassium ion with standard addition method in orange juice, vitamin, and edible salt. The amount of K+ found was 1.97 ± 0.06 mg/mL in orange juice, 0.420 ± 0.008 % (m/m) in vitamin tablet and 0.52 ± 0.08 % (m/m) in edible salt.

Keywords: Potassium ion selective electrode, Membrane electrode, Potassium ion, Crown ether

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Article Details

Year: 2009
Page: [53 - 58]
Pages: 6
DOI: 10.2174/157341109787047880

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