铝酸根离子选择性膜电极的研制

Aluminate anion-selective membrane electrode

以转型了的N2 63 Cl,N2 63 I和四丁基碘化铵作为电活性物质 ,以聚乙烯醇 (PVA)和壳聚糖 (CS)作为聚合物支持体 ,制成了对铝酸根离子有响应的离子选择性膜电极。其中以N2 63 I制成的膜电极对铝酸根离子的响应较好 ,并研究了N2 63 I的用量及转型条件对该膜电极性能的影响。考察了在不同碱度的待测溶液中以及升温条件下 ,该膜电极的膜电位与铝酸根离子浓度的关系。结果表明 ,该膜电极在 0 .0 1～ 2mol/L的浓度范围内对铝酸根离子有良好的Nernst响应 ,其级差随着温度的升高而增大 ,测得常温下膜电位级差约为 1 0 .3mV每 1 0倍浓度变化 ,60℃时约为 1 5.4mV每 1 0倍浓度变化 ,75℃时约为 1 8.3mV每 1 0倍浓度变化。

Aluminate anion seletive membrane eletrodes based on 3 decylmethyl ammonium chloride(N263 C1), 3 decylmethyl ammonium iodide(N263 I) and 4 butyl ammonium iodide in poly(vinyl alcohol)(PVA) and chitoson(CS) were prepared. The relationship of membrane potentials with concentrations of aluminate ion was studied under the conditions of different quaternary ammonium compounds, various alkalinities and various temperatures. The results show that the membrane electrode based on N263 I in PVA and CS has a good Nernst response for aluminate ion in the concentration range of 10 -2 ～2 mol/L. The slope of the Nernst equation for this electrode increases with temperature. The slope for the electrode based on N263 I is 10 mV per decade concentration change, 15.4 mV per decade concentration change and 18.3 mV per decade concentration change at room temperature, 60 ℃ and 75 ℃, respectively. The membrane electrode prepared had good reproducibility and stablility. The common anions have no effect on the electrode response except ClO - 4, S 2- and F -. [