Solid-state ion-selective electrodes for the potentiometric determination of hexacyanoferrate (II) |
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| Authors: | Gwon-shik Ihn Moo-jeong Sohn Richard P Buck |
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| Institution: | Department of Chemistry, Keimyung University, Daegu 634 Korea;Department of Chemistry, University of North Carolina, Chapel Hill, NC U.S.A. |
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| Abstract: | Hexacyanoferrate(II)-sensing electrodes were prepared by mixing Ag2S and Ag4Fe (CN)6. The 6:1 Ag2S/Ag4Fe (CN)6 provided the best potentiometric response and speed of response. The log concentration vs. potential curves were linear with Nernstian slope (14.8 mV/decade) over the range 10?1-10?6 M hexacyanoferrate (II) at pH 7.00 with constant ionic strength. Interferences included iodide, sulfide and bromide. This electrode was used as indicator in potentiometric titrations of hexacyanoferrate (II). |
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