Highly Selective Potentiometric Determination of Ag(I) Using 1,2,4,5-tetrakis(8-hydroxyquinolinoxymethyl)benzene Based Coated-Wire Ion-Selective Electrode

作者：Kumar S K Ashok; Mittal Susheel K; Kumar Subodh

来源：Sensor Letters, 2011, 9(4): 1390-1397.

DOI：10.1166/sl.2011.1696

• Coated-Wire Ion-Selective Electrode (CWISE)
• Silver (I) Ion
• 8-Hydroxyquinoline
• Tetrapodal
• Selectivity Coefficient
• Indicator Electrode

A coated-wire silver ion-selective electrode (ISE) is constructed using 1,2,4,5-tetrakis(8-hydroxyquinolinoxymethyl)benzene (I) as neutral carrier in a poly(vinyl chloride) matrix plasticized with 2-nitrophenyl octyl ether. The best membrane composition (w/w) for the sensor is PVC 33%, plasticizer 63%, ionophore 4%. The sensor exhibited a linear Nernstian response over the concentration range 1 x 10(-5) M to 1 x 10(-1) M with a slope of 60 +/- 1 mV per decade change and a detection limit of 1 x 10(-6) M. The working pH range is 3.5-7.5. The response time of sensor is 15 s and it can be used for at least 2 months without any significant divergence in potential. The sensor shows good selectivity over a number of alkali, alkaline earth and several transition and heavy metal ions. The electrode is used as an indicator electrode for the determination of Ag(+) in various synthetic samples and also used for the determination of SCN(-), CN(-), S(-2) and l(-) contents present in the sample solution.

• 出版日期2011-8