New nickel(II) selective potentiometric sensor based on 5,7,12,14-tetramethyldibenzotetraazaannulene in a poly(vinyl chloride) matrix

被引:270
作者
Gupta, VK [1 ]
Prasad, R [1 ]
Kumar, P [1 ]
Mangla, R [1 ]
机构
[1] Univ Roorkee, Dept Chem, Roorkee 247667, Uttar Pradesh, India
关键词
PVC; nickel sensor; ion selective electrode;
D O I
10.1016/S0003-2670(00)01013-8
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
5,7,12,14-Tetramethyldibenzotctraazaannulene (Me(4)Bzo(2)TAA) has been explored as an electroactive material for preparing poly(vinyl chloride) (PVC)-based membrane electrodes selective to Ni2+. The membrane having the constituents Me(4)Bzo(2)TAA, sodium tetraphenyl borate (NaTPB) and PVC in the optimum ratio 2:1:97 (w/w) gave the best working concentration range (7.9x 10(-6)-1.0x 10(-1) M) with a Nernstian slope (30.0+-1.0 mV/decade of activity) in the pH range 2.7-7.6. The sensor exhibits a fast response time of 15 s. The electrode shows good selectivity for nickel(II) over a number of mono-, bi- and tri-valent cations. Analytical application of the electrode has been investigated for the quantitative determination of Ni2+ in chocolates and the sensor has been successfully used as an indicator electrode in the potentiometric titration of Ni2+ against EDTA. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:19 / 27
页数:9
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