Mortimer RJ, Barbeira PJ, Sene AF, Stradiotto NR. Potentiometric determination of potassium cations using a nickel(II) hexacyanoferrate-modified electrode.
Talanta 2012;
49:271-5. [PMID:
18967597 DOI:
10.1016/s0039-9140(98)00373-7]
[Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/1998] [Revised: 11/23/1998] [Accepted: 11/27/1998] [Indexed: 11/28/2022]
Abstract
Electroactive nickel(II) hexacyanoferrate (NiHCF) thin film modified electrodes are effective potentiometric sensors for the determination of potassium ions. The NiHCF films are deposited onto glassy carbon electrodes by repetitive potential cycling in K(3)Fe(CN)(6)/NaNO(3)/Ni(NO(3))(2) solution. The modified electrodes exhibit a linear response to potassium ions in the concentration range 1x10(-3) to 2.0 mol dm(-3), with a near-Nernstian slope (45-49 mV per decade) at 25 degrees C. In the determination of potassium ion in syrups used for treatment of potassium deficiency, the NiHCF-modified electrode gave comparable results to those obtained using flame emission spectrophotometry.
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