研究生: |
麥菁菁 Ching-Ching Mai |
---|---|
論文名稱: |
碳六十/大環胺醚在銀(I)及碘(I)離子選擇性電極上之應用 Application of C60-Cryptand 22 in Bifunctional Ion-Selective Electrodes for Silver and Iodine Ions |
指導教授: |
施正雄
Shih, Jeng-Shong |
學位類別: |
碩士 Master |
系所名稱: |
化學系 Department of Chemistry |
畢業學年度: | 87 |
語文別: | 中文 |
論文頁數: | 105 |
中文關鍵詞: | 離子選擇性電極 |
英文關鍵詞: | Ion-Selective Electrodes |
論文種類: | 學術論文 |
相關次數: | 點閱:260 下載:0 |
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碳六十/大環胺醚在銀(I)及碘(I)離子選擇性電極上之應用
中文摘要
碳六十/大環胺醚已成功的應用在離子管柱層析、石英壓電偵測器的材質上。本研究以之作為電極膜材料,進行陰陽離子選擇性電極之研發。在陽離子選擇性電極方面,以碳六十/大環胺醚作為電極膜中的中性載體,藉由銀離子和大環胺醚的錯合力,再配合10-3M硝酸銀為內溶液,便製成了對銀離子有特殊選擇性的銀離子選擇性電極。Ag+ ISE在銀離子濃度範圍在10-3.5~10-1M內,具有58.5mV/decade的能斯特(Nernst)線性電極電位反應,其穩定度與再現性都不錯。此銀離子電極對鹼金屬、鹼土金屬及過渡金屬離子之選擇性係數約介於10-3~10-2之間。將銀離子選擇性電極應用在滴定終點之偵測,可穩定且準確的測知氯化鈉溶液滴定硝酸銀溶液之滴定當量點。
當碳六十/大環胺醚電極之內溶液改為10-4M之KI(aq)且pH值降至2以下,膜內的大環胺醚被質子化,轉變成為陰離子載體,此碳六十/大環胺醚電極就可轉換成碘離子選擇性電極。此電極在碘離子濃度為10-3~10-1M範圍內,具有-58.5mV/decade能斯特(Nernst)靈敏度。陰離子選擇性係數測定結果顯示,除了鹵素離子、硝酸根離子、硫氰根離子外,一般離子對碘電極干擾都不大。
Application of C60-Cryptand 22 in Bifunctional Ion-Selective Electrodes for Silver and Iodine Ions
Abstract
Fullerene(C60)-cryptand22(1,7,10,16Tetraoxa4, 13diazacyclooctadecan) had been prepared and successfully used in ion-chromatography, piezoelectric quartz detector and now being applied as neutral carrier in electric membrane of cation/anion-selective electrode. With excellent stability of complex [Ag-cryptand22]+, the C60-cryptand22 based electrode with AgNO3(aq)(10-3 M, pH=6.3) as internal solution gave a linear response 59.5 mV/decade within the concentration range 10-3.5-10-1M Ag+(aq) and had selectivity coefficients about 10-3~10-2 for alkali, alkaline earth and transition metal ions. The Ag+ ISE with good stability and reproducibility had been successfully used in the titration of Ag+(aq) with KCl(aq). The C60-cryptand electrode could be switched to be an iodide ion-selective electrode with an acidic internal solution of 10-4M KI(aq) (pH=2) which the cryptand was protonated and switched to be an anion electric carrier. I- ISE gave slope -58.5 mV/decade within 10-3~10-1M I-(aq) and had small selectivity coefficients for most anions except SCN-, NO3-, Br- and Cl-.
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