高等学校化学学报 ›› 1993, Vol. 14 ›› Issue (12): 1658.

• 研究论文 • 上一篇    下一篇

锂离子选择性电极的研究

张增荣, 俞汝勤   

  1. 湖南大学化学化工系, 长沙 410082
  • 收稿日期:1992-01-12 修回日期:1993-07-28 出版日期:1993-12-24 发布日期:1993-12-24
  • 通讯作者: 张增荣, 男, 28岁, 博士研究生
  • 作者简介:张增荣, 男, 28岁, 博士研究生
  • 基金资助:

    国家自然科学基金

Lithium Ion-Selective Electrode

ZHANG Zeng-Rong, YU Ru-Qin   

  1. Department of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082
  • Received:1992-01-12 Revised:1993-07-28 Online:1993-12-24 Published:1993-12-24

摘要: 根据锂的萃取化学,以1-(苯基偶氮)萘酚-2(ST-I)及氧化三辛基膦(TOPO)为载体和协萃剂制备了PVC膜锂离子选择性电极.考察了增塑剂等因素对电极响应性能的影响,并对膜组成进行优化.以含4.5mgST-I,9.0mgTOPO及180mg磷酸三丁酯的膜制备的电极在pH8.5的tris缓冲底液中对锂呈线性电位响应,斜率为51.7mV/pC,线性范围为2.0×10-5~1.0×10-1mol/L,检测下限为4.0×10-6mol/L.电极用于碳酸锂片剂中锂含量测定,结果满意.

关键词: 1-(苯基偶氮)萘酚-2, 氧化三辛基膦, 锂, 离子选择电极

Abstract: Making use of the extraction chemistry of lithium, a PVCmembrane lithium ion-selective electrode based on 1-phenylazonaphthol-2 (sutan Ⅰ) and tri-n-octylphosphine oxide (TOPO) was prepared.The membrane composition was optimized by orthogonal polynomial regression.Amembrane containing 4.5 mg sutan Ⅰ and 9.0 mg TOPOand 180 mg solvent mediator was obtained.The slope of the electrode was 51.7 mV/decade, with the linear range of 2.0 × 10-5-0.1 mol/Land the detection limit of 4.0× 10-6 mol/L.The electrode showed moderate selectivities for Li+ over Na+ and K+, and was applied to the assary of lithium in Li2CO3 tablets with satisfactory results.

Key words: 1-Phenylazonaphthol-2, Tri-n-octylphosphine oxide, Lithium, Ion-selective elec-trode

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