(中南工業(yè)大學(xué) 化學(xué)化工學(xué)院， 長沙 410083)
摘 要: 以轉(zhuǎn)型了的N263Cl， N263I和四丁基碘化銨作為電活性物質(zhì)， 以聚乙烯醇(PVA)和殼聚糖(CS)作為聚合物支持體， 制成了對鋁酸根離子有響應(yīng)的離子選擇性膜電極。其中以N263I制成的膜電極對鋁酸根離子的響應(yīng)較好， 并研究了N263I的用量及轉(zhuǎn)型條件對該膜電極性能的影響。考察了在不同堿度的待測溶液中以及升溫條件下，該膜電極的膜電位與鋁酸根離子濃度的關(guān)系。結(jié)果表明，該膜電極在0.01～2 mol/L的濃度范圍內(nèi)對鋁酸根離子有良好的Nernst響應(yīng)， 其級差隨著溫度的升高而增大， 測得常溫下膜電位級差約為10.3 mV每10倍濃度變化， 60 ℃時(shí)約為15.4 mV每10倍濃度變化， 75 ℃時(shí)約為18.3 mV每10倍濃度變化。
關(guān)鍵字: 鋁酸根離子； 膜電極； 離子選擇性
（College of Chemistry and Chemical Engineering, Central South University of Technology,Changsha 410083, P.R.China）
Abstract:Aluminate anionseletive membrane eletrodes based on 3decylmethyl ammonium chloride(N263C1), 3decylmethyl ammonium iodide(N263I) and 4butyl ammoniumiodide in poly(vinyl alcohol)(PVA) and chitoson(CS) were prepared. The relationship ofmembrane potentials with concentrations of aluminate ion was studied under theconditions of different quaternary ammonium compounds, various alkalinities and various temperatures. The results show that the membrane electrode based on N263Iin PVA and CS has a good Nernst response for aluminate ion in the concentrationrange of 102-～2 mol/L. The slope of the Nernst equation for this electrode increases with temperature. The slope for the electrode based on N263I 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, S2- and F-.
Key words: aluminate ion； membrane electrode； ionic selectivity
