锂离子选择性电极的研究  

Lithium Ion-Selective Electrode

作　　者：张增荣[1] 俞汝勤[1] 

机构地区：[1]湖南大学化学化工系,长沙410082

出　　处：《高等学校化学学报》1993年第12期1658-1660,共3页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金

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4.5mg ST-I,9.0mg TOPO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^(-1)mol/L,检测下限为4.0×10^(-6)mol/L.电极用于碳酸锂片剂中锂含量测定,结果满意.Making use of the extraction chemistry of lithium, a PVC membrane 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. A membrane containing 4. 5 mg sutan Ⅰ and 9. 0 mg TOPO and 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/L and 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.

关 键 词：锂 离子选择电极 

分 类 号：O657.15[理学—分析化学]