Abstract
A new PVC membrane electrode for dibasic phosphate anion based on Ferrocene-bearing macrocyclic amide compound ( L) has been prepared. The construction, response characteristic, selectivity and application of the electrode are investigated in detail. The best performance is exhibited by the electrode membrane containing 20 mol% TDMACl with o-NPOE as a plasticizer, and the electrode shows good selectivity towards HPO 4 2− over a wide concentration range (1.0 × 10 −2 to 1.0 × 10 −5 M) with a Nernstian slope of 29.8 mV per decade at pH 9.0, and a detection limit of 2.2 × 10 −6 M. It has a very short response time, less than 20 s, and can be used for at least 2 months without any divergence in response slope and linear range. The electrode displays high selectivity towards dibasic phosphate with respect to many other anions including Cl −, Br −, I −, NO 3 −, OAc −, and SO 4 2−. The proposed electrode has been used as the indicator electrode in titration of phosphate with Ba(NO 3) 2 solution.
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