Journal
ANALYTICA CHIMICA ACTA
Volume 579, Issue 1, Pages 102-108Publisher
ELSEVIER
DOI: 10.1016/j.aca.2006.07.022
Keywords
potentiometric Sn(II) sensor; poly(vinyl chloride) membrane; non-aqueous media; isothermal temperature coefficient
Categories
Ask authors/readers for more resources
A Sn2+ ion-selective electrode which was prepared with a polymeric membrane based on 6-(4-nitrophenyl)-2,4-diphenyl-3,5-diazabicyclo[3.1.0]hex-2-ene (NDDBH) as a ionophore. Effects of experimental parameters such as membrane composition, nature and amount of plasticizer, the amount of additive and concentration of internal solution on the potential response of Sn2+ sensor were investigated. The electrode exhibited a Nernstian slope of 28.8 +/- 1.1 mV/decade of Sn2+ over a concentration range of 1.0 x 10(-5) to 1.0 x 10(-1) M of Sn2+ in an acidic solution (pH 1). The limit of detection was 4.0 x 10(-6) M. The results show that this electrode can be used in ethanol media until 20% (v/v) concentration without interference. It can be used for more than 6 weeks without any considerable divergence in the potentials. The proposed membrane electrode revealed very good selectivity for Sn(II) ions over a wide variety of other cations and could be used in acidic media. The standard electrode potentials were determined at different temperatures and used to calculate the isothermal coefficient of the electrode. The stability constant (log K-s) of the Sn(II)-ionophore complex was determined at 25 degrees C by potentiometric titration in mixed aqueous solution. It was used as indicator electrode in potentiometric determination of Sn(II) ion in real samples. (c) 2006 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available