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Abstract: Preliminary solution study shows the selectivity of di-tert-butylazodicarboxylate (TBADC) toward Fe(III) ions. Due to this selectivity, it was applied as an ionophore for construction of a Fe(III) sensor. The proposed sensor exhibits a wide linear response range with a Nerstian slope of 19.4±0.4mVdecade−1 and detection limit of 4.8×10−8 molL−1. The sensor response is pH independent in the range of 2.3–3.4 and has a fast response time of <10s. It also shows very good selectivity to Fe(III) ion over many mono-,di- and trivalent transition and heavy metal ions. The life time of the electrode was at least 10weeks. The application of the TBADC-based sensor to analysis of Fe(III) ion in a pharmaceutical formulation, and also to the monitoring of Fe(III) ion in mixtures of two, three and four different ions showed satisfactory results. [Copyright &y& Elsevier]

Abstract: According to a solution study which showed a selective complexation between N,N′-bis(methylsalicylidene)-2-aminobenzylamine (MSAB) and gadolinium ions, MSAB was used as a sensing element in construction of a gadolinium(III) ion selective electrode. Acetophenon (AP) was used as solvent mediator and sodium tetraphenyl borate (NaTPB) as an anion excluder. The electrode showed a good selectivity towards Gd(III) ions over a wide variety of cations tested. The constructed sensor displayed a Nernstian behavior (19.7±0.3mV/decade) in the concentration range of 1.0×10−6 to 1.0×10−2 molL−1 with detection limit of 5.0×10−7 molL−1 and a short response time (<10s). The working pH range of the electrode was 3.5–10.1 and lifetime of the sensor was at least 10weeks. Analysis of certified reference materials confirmed the accuracy of the proposed sensor. The electrode was successfully applied as an indicator electrode in gadolinium titration with EDTA. [Copyright &y& Elsevier]

Abstract: Solution study showed N,N′-bis(5-nitrosalicylidene)-2-aminobenzylamin (L) trends toward Tb3+ ion. Then, it was used as a suitable ionophore in construction of terbium ion selective electrode. The electrode with composition of 30% PVC, 65% solvent mediator (NB), 3% ionophore (L) and 2% anionic additive (NaTPB) shows the best potentiometric response characteristics. It displays a Nernstian behavior (20.1mVdecade−1) over the concentration range 1.0×10−6 to 1.0×10−2 molL−1. The detection limit of the electrode is 6.3×10−7 molL−1. It has a very short response time (~10s) and a useful working pH range of 2.6–9.4 for at least 2months. The proposed membrane sensor shows excellent discriminating ability towards Tb3+ ions with regard to several alkali, alkaline earth, transition and heavy metal ions. To investigate the analytical applicability of the sensor, it was successfully applied to the determination of terbium in certified reference material. [ABSTRACT FROM AUTHOR]

Abstract: A new Pr3+ poly vinyl chloride PVC membrane sensor based on a membrane containing 3% N,N′-bis(4-hydroxysalicylidene)-1-3-phenylenediamine (HSPDA) as an ionophore, 2% sodium tetraphenyl borate (NaTPB) as an anionic additive, 65% benzyl acetate (BA) as solvent mediator and 30% poly(vinyl chloride) was prepared. This sensor responds to praseodymium ion in a wide linear dynamic range of 1.0×10−6 to 1.0×10−2 molL−1 with Nernstian slope of 19.8±0.4mV per decade and a detection limit of 5.7×10−7 molL−1 in pH range of 3.1 to 9.8. It has a fast response time of ~5s in the whole concentration range, and can be used for at least 2months without any considerable divergences in the potentials. The proposed sensor displays an excellent selectivity for Pr3+ ions with respect to a large number of alkali, alkaline earth, transition and heavy metal ions. The developed sensor was successfully applied as an indicator electrode in Pr3+ ion potentiometric titration with EDTA, and in direct determination of fluoride ion in two mouth wash samples. [ABSTRACT FROM AUTHOR]

Abstract: The PVC membrane, containing benzyl bisthiosemicarbazone (BTC) as a suitable ionophore, exhibited a Nernstian response for the Nd3+ ions over a wide concentration range between 1.0×10−2 and 1×10−6 M, with a detection limit of 6.2×10−7 M in the pH range of 3.7–8.3. It demonstrated a fast response time (<10s) and it could be used for at least 7 weeks without any major potential deviation. Furthermore, the electrode revealed high selectivity with respect to all the common alkali, alkaline earth, transition and heavy metal ions, including the members of the lanthanide family other than Nd3+. Concerning its applications, it was effectively employed for the determination of neodymium ions in soil and sediment samples and its validation with CRM. [Copyright &y& Elsevier]

Abstract: A highly selective membrane electrode based on nickel(II)-1,4,8,11,15,18,22,25-octabutoxyphthalocyanine (NOBP) is presented. The proposed electrode shows very good selectivity for thiocyanate ions over a wide variety of common inorganic and organic anions. The sensor displays a near Nernstian slope of −58.7±0.6mV per decade. The working concentration range of the electrode is 1.0×10−6 to −1.0×10−1 M with a detection limit of 5.7×10−7 M (33.06ng/mL). The response time of the sensor in whole concentration ranges is very short (<10s). The response of the sensor is independent on the pH range of 4.3–9.8. The best performance was obtained with a membrane composition of 30% PVC, 65% dibutyl phthalate, 3% NOBP and 2% hexadecyltrimethylammonium bromide. It was successfully applied to direct determination of thiocyanate in biological samples, and as an indicator electrode for titration of thiocyanate ions with AgNO3 solution. [Copyright &y& Elsevier]