Transport of Ions of Pyrophosphoric Acid
through Chemically Different Anion-Exchange Membranes

V. V. Kotov, D. V. Nenakhov^z, and K. E. Stekol’nikov

Voronezh State Agricultural University, ul. Michurina 1, Voronezh 394087, Russia

Received October 20, 2008

Abstract—Characteristics of mass transport of the anions of pyrophosphoric acid are investigated during elec-
trodialysis through MA-40 and MA-41 anion-exchange membranes. It is established that the rate of mass trans-
port for counterions is greater through the MA-41 membrane than the MA-40 membrane, and thus the former
can be used for demineralizing solutions with salts of pyrophosphoric acid. Higher selectivity to pyrophosphate
ions is found for the MA-40 membrane compared to the MA-41 membrane in the electrodialysis of mixtures
of pyrophosphate and hydropyrophosphate ions, and thus the MA-40 membrane can be regarded as promising
for the separation of such mixtures.

Key words: electrodialysis, mass transport, anionites, pyrophosphoric acid, MA-40 and MA-41 anion-exchange
membranes

DOI: 10.1134/S1023193510010143

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