Sorption preconcentration of IO3- and I- ion anionites AV-17 and silica gels with quaternary ammonium groups - M. F. Zuj; L. V. Shvidka; L. S. Kiforuk; S. A. Alekseev; V. I. Gerda; V. N. Zajtsev (Journal of water chemistry and technology, 2011)