TY JOUR TI HEAVY METAL (Cu, Zn, Fe, Mn, Pb, Cd) CONCENTRATION IN SOILS OF TYUMEN KW JO Bulletin of Nizhnevartovsk State University AU Petukhov, A.S. AU Kremleva, T.A. AU Khritokhin, N.A. AU Petukhova, G.A. AU Kaidunova, P.I. PY 2020 IS PB Nizhnevartovsk State University