Extraction of Zn (II) and Cu (II) Ions Using PEG (300) - KCl Salt Aqueous Two-Phase Systems. Al-Khwarizmi Engineering Journal, [S. l.], v. 7, n. 2, p. 68–74, 2011. Disponível em: https://alkej.uobaghdad.edu.iq/index.php/alkej/article/view/49. Acesso em: 1 apr. 2025.