Mortimer R J, Barbeira P J, Sene A F, Stradiotto N R
Department of Chemistry, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK.
Talanta. 1999 Jun 14;49(2):271-5. doi: 10.1016/s0039-9140(98)00373-7.
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.
电活性六氰合铁酸镍（II）（NiHCF）薄膜修饰电极是用于测定钾离子的有效电位传感器。通过在K(3)Fe(CN)(6)/NaNO(3)/Ni(NO(3))(2)溶液中重复进行电位循环，将NiHCF薄膜沉积在玻碳电极上。修饰电极在1×10(-3)至2.0 mol dm(-3)的浓度范围内对钾离子呈现线性响应，在25℃时具有接近能斯特斜率（每十倍浓度变化45 - 49 mV）。在测定用于治疗钾缺乏症的糖浆中的钾离子时，NiHCF修饰电极给出的结果与使用火焰发射分光光度法获得的结果相当。
