Extraction of Zn (II) and Cu (II) Ions Using PEG (300) - KCl Salt Aqueous Two-Phase Systems. alkej [Internet]. 2011 Jun. 30 [cited 2024 May 3];7(2):68-74. Available from: https://alkej.uobaghdad.edu.iq/index.php/alkej/article/view/49