TY JOUR TI THE REGULARITY OF THE METAL CATION SORPTION BY THE MODIFIED BARK OF SIBERIAN CONIFEROUS TREE SPECIES KW bark utilization KW modification KW metal cation sorption JO Bulletin of KSAU AU Semenovich, A.V. AU Loskutov, S.R. PY 2015 IS PB Krasnoyarsk State Agrarian University