Multisensor system for determination of iron(II), iron(III), uranium(VI) and uranium(IV) in complex solutions

Development and analytical evaluation of a multisensor system based on the principles of "electronic tongue" for the determination of low contents of uranium(VI), uranium(IV), iron(II) and iron(III) in complex aqueous media h ave been carried out. A set of 29 different chemical sensors on the basis o f all-solid-state crystalline and vitreous materials with enhanced electron ic conductivity and redox and ionic cross-sensitivity have been incorporate d into the sensor array. Multidimensional data have been processed by patte rn recognition methods such as artificial neural networks and partial least squares. It has been demonstrated that Fe(II) and Fe(III) contents in the range from 10(-7) to 10(-4) mol L-1 of total iron concentration can be dete rmined with the average precision of about 25%. U(VI) and U(IV) contents ca n been determined with the average precision of 10-40% depending on the con centration. The developed multisensor system can be applied in future for t he analysis of mining and borehole waters as well other contaminated natura l media, including on-site measurements.