Abstract
A sensitive membrane of a new type was suggested for the determination of calcium ions in aqueous solutions. Polylayer membranes were formed by the Langmuir-Blodgett method from octadecylamine and 1,2-bis-(2-aminophenoxy)ethane-N,N,N,N-tetraacetic acid. When brought in contact with an aqueous solution of a calcium salt, the ultrathin film sorbs metal ions. The chelator then transports metal ions over the whole membrane volume, and the ions are accumulated in the form of calcium hydroxide crystallites in regions enriched in the diphilic base. The main analytic parameters were determined by piezoquartz weighing, electrochemical impedance spectroscopy, and surface plasmon resonance spectroscopy. The response of sensor elements of this type was shown to be a linear function of the logarithm of the concentration of calcium ions over the concentration range 10−8–10−1 mol/l at the contact time between the film and the solution under study no more than 10 s. The conclusion was drawn that the membranes obtained remained highly sensitive with respect to calcium ions in 0.1 M solutions of NaCl and were selective with respect to other biologically relevant cations.
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Original Russian Text © M.A. Kalinina, O.A. Raitman, D.S. Turygin, S.L. Selektor, N.V. Golubev, V.V. Arslanov, 2008, published in Zhurnal Fizicheskoi Khimii, 2008, Vol. 82, No. 8, pp. 1501–1510.
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Kalinina, M.A., Raitman, O.A., Turygin, D.S. et al. Langmuir-Blodgett composite films for the selective determination of calcium in aqueous solutions. Russ. J. Phys. Chem. 82, 1334–1342 (2008). https://doi.org/10.1134/S0036024408080165
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DOI: https://doi.org/10.1134/S0036024408080165