Zinc(II) PVC-based membrane sensor based on 5,6-benzo-4,7,13,16,21,24- hexaoxa-1,10-diazabicyclo[8,8,8]hexacos-5-ene

Journal of the Brazilian Chemical Society

Ganjali, Mohammad Reza¹  Tehran University, Tehran¹  Zamani, Hassan Ali¹  Islamic Azad University, Quchan¹  Pooyamanesh, Mohammad Jan¹ 

关键词: 5;    6-benzo-4;    7;    13;    16;    21;    24-hexaoxa-1;    10-diazabicyclo[8;    8;    8]hexacos-5-ene;    zinc sensor;    potentiometry;    PVC;   

DOI  :  10.1590/S0103-50532006000100021

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

The 5,6-benzo-4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8,8,8]hexacos-5-ene (BHDE) was used as an excellent ionophore in construction of a Zn(II) PVC-based membrane sensor. The best performance was obtained with a membrane composition of 30% poly(vinyl chloride), 64.5% nitrobenzen (NB), 2.5% BHDE and 3% sodium tetraphenylborate (NaTPB). This sensor shows very good selectivity and sensitivity towards zinc ion over a wide variety of cations, including alkali, alkaline earth, transition and heavy metal ions. The sensor revealed a great enhancement in selectivity coefficients for zinc ions, in comparison to the previously reported zinc sensors. The proposed sensor exhibits a Nernstian behavior (with slope of 29.1 ± 0.4 mV per decade) over a wide concentration range (1.0 ´ 10-6—1.0 ´ 10-1 mol L-1) with a detection limit of 6.3 ×10-7 mol L-1 (41.2 ng mL-1). It shows relatively fast response time, in the whole concentration range (< 10s), and can be used for at least 10 weeks in a pH range of 2.8–7.3. The proposed sensor was successfully used in direct determination of zinc ions in wastewater of industrial zinc electroplating companies, and also as an indicator electrode in titration with EDTA.

【 授权许可】

Unknown