Wannawek, A., Pookmanee, P., Satienperakul, S., Putharod, R., Laorodphan, N. and Phanichphant, S. (2016) “Removable Pb (II) from aqueous solutions by adsorption onto natural and modified leonardite”, Engineering and Applied Science Research, 43, pp. 477–479. Available at: https://ph01.tci-thaijo.org/index.php/easr/article/view/70839 (Accessed: 19 May 2024).