物理化学学报 >> 1987, Vol. 3 >> Issue (06): 587-591.doi: 10.3866/PKU.WHXB19870606

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Na-β氧化铝/NaOH水溶液界面电势的测定

杨华铨; 毛兵; 陈波珍; 杨文治   

  1. 北京大学化学系
  • 收稿日期:1986-06-20 修回日期:1986-12-16 发布日期:1987-12-15

MEASUREMENTS OF THE POTENTIAL DIFFERENCE ACROSS THE Na-BETA ALUMINA/NaOH AQUEOUS SOLUTION INTERFACES

Yang Huaquan; Mao Bing; Chen Bozhen; Yang Wenzhi   

  1. Chemistry Department of Peking University
  • Received:1986-06-20 Revised:1986-12-16 Published:1987-12-15

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摘要： 测定了Na-β氧化铝管在NaOH、NaOH-KOH、NaOH-(CH_3)_4NOH以及NaOH-NaCl四种溶液的浓差电池体系中的电动势, 求得Na-β氧化铝与NaOH水溶液之间的界面电势Δφ。结果表明: 在NaOH、NaOH-NaCl水溶液中, Δφ与loga_2(Na~+)/a_1(Na~+)之间的关系服从Nernst公式; K~+离子的存在影响Δφ值, 而OH~-、(CH_3)_4N~+贴无影响。探讨了用β氧化铝在高浓碱性Na~+水溶液中做Na~+离子选择性电极的可能性。

Abstract: EMF of the concentration cells of sodium beta alumina tubes in four aqueous solutions: NaOH, NaOH-KOH, NaOH-(CH_3)_4NOH and NaOH-NaCl were measured. The potential differences across the Na-beta alumina/NaOH aqueous solution interfaces Δφ, were obtained. The results showed that the relations between Δφ and loga_2 (Na)~+/a_1(Na~+) obeyed the Nernst equation in NaOH, NaOH-NaCl aqueous solutions. The presence of K~+ ions influenced Δφ, but OH~-, (CH_3)_4N~+ did not. The possi- bility of using the beta alumina as a Na~+-ion selective electrode in alkaline Na~+-ion aqueous solutions (if Na~+ concentration≥0.01 mol L~(-1).) was discussed.