A tetradecylphosphonium compounds–based membrane sensor for potentiometric quantitation of pertechnetate-ions in cementitious radioactive waste

[Display omitted] •A novel membrane-based ion sensor for pertechnetate-ions was fabricated.•Introducing tetradecylphosphonium tetraphenylborate into the membrane enhanced sensor characteristics.•The sensor was applied to the technetium quantitation in cementitious radioactive waste. A novel potentio...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2020-05, Vol.310, p.127853-6, Article 127853
Main Authors: Kopytin, A.V., German, K.E., Zhizhin, K.Y., Safonov, A.V., Zhukov, A.F., Shpigun, L.K.
Format: Article
Language:English
Subjects:
Aqueous solutions
Cubes
Mathematical analysis
Membranes
Pertechnetate-ion
Polymeric membrane
Potentiometric ion sensor
Radioactive waste disposal
Radioactive waste disposal products
Radioactive wastes
Selectivity
Sensors
Tetradecylphosphonium compounds
Vinyl chloride
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Summary:[Display omitted] •A novel membrane-based ion sensor for pertechnetate-ions was fabricated.•Introducing tetradecylphosphonium tetraphenylborate into the membrane enhanced sensor characteristics.•The sensor was applied to the technetium quantitation in cementitious radioactive waste. A novel potentiometric sensor has been developed for the determination of pertechnetate ions (TсO4‾) by using on two synthesized tetradecylphosphonium salts, tetradecylphosphonium pertechnetate and tetradecylphosphonium tetraphenylborate, as sensing components of a poly (vinyl chloride) matrix membrane. Potentiometric studies have confirmed the improvement in response characteristics of the sensor based on the membrane system containing a mixture of both tetradecylphosphonium salts. Such sensor exhibits a stable Nernstian response over a wide concentration range of pertechnetate ions (10−2 – 5 × 10-7 M) in aqueous solutions with the acidity from 3 M HCl to pH 12. The lower limit of detection is 0.15 μM. The calculated potentiometric selectivity coefficients moderate selectivity for TсO4‾ ions over the interfering anions and these values are clearly in agreement with the standard Gibbs energies of the ions transfer between water and NPOE. The reported sensor was successfully employed for the pertechnetate quantitation in the radioactive waste disposal products (cement cubes).
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2020.127853