- Impact of EDTA and humic substance on the removal of Cd2+ and Zn2+ from aqueous solutions by apaptiteViipsi, Karin; Sjöberg, Staffan; Tõnsuaadu, Kaia; Shchukarev, AndreyEnvironment abstracts : seventh Annual International Conference on Environment : 14-17 May 2012, Athens, Greece2012 / p. 85-86