13-18 May 2018
Casino Conference Centre
Europe/Prague timezone

Potentiometric uranyl-selective sensor based on a new supramolecular composition

14 May 2018, 17:15
1h 30m
Gallery (Casino Conference Centre)

Gallery

Casino Conference Centre

Poster Nuclear Analytical Methods Poster NAM

Speaker

Dr Alexey Safonov (Frumkin Institute of Physical Chemistry Russian Academy of Science)

Description

A new supramolecular composition containing a clozoborane salt UO2 [ B10H9S(C18H39)]2 ,
polyvinyl chloride (PVC) as a matrix and tris (2-ethylhexyl) phosphate. The membranes of various compositions with different ratios of membrane components were investigated.
The membrane with the best electroanalytical characteristics has the following composition:
Сs B10H9S(C18H37)2 : 1 – 3 % (mass),
tris (2-ethylhexyl) phosphate: 65 – 72 %
PVC: 27 – 32 %
The developed electrode had a linear potential dependence in the range not worse than pUO22+ = 2 – 6, The detection limit for uranyl ions was C(UO22+) = 1,6*10 -7 М. The measured selectivity factors are given in the table:
Anion Cs+ Rb+ K+ Na+ Sr2+ Ca2+ Mg2+
Кselect 8•10-5 8,2•10-5 9•10-5 1,1•10-4 3,0•10-5 1,05•10-4 2,2•10-5

As follows from the values of the selectivity coefficients, the developed electrode showed a very high selectivity with respect to uranyl ions in the presence of alkaline and basic alkaline earth cations.
From the analysis of selectivity data, it should be noted that the behavior of the proposed supramolecular system does not obey the Hofmeister series. It has been established that even 10 + 4-fold excesses of alkali and alkaline earth ions do not significantly affect the membrane potential. The established series of selectivity series looked as follows:
UO22+ > Li+ > Na > K > Cs > Ca > Mg

Primary authors

Dr Alexander Kopytin (N.S. Kurnakov Institute of the Russian Academy of Sciences) Dr Konstantin Zhizhin (N.S. Kurnakov Institute of the Russian Academy of Sciences) Dr Alexey Safonov (Frumkin Institute of Physical Chemistry Russian Academy of Science) Dr Konstantin German (A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences) Dr Alexey Kubasov (N.S. Kurnakov Institute of the Russian Academy of Sciences) Dr Andrey Afanasyev (A.N. Frumkin Institute of Physical Chemistry and Electrochemistry)

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