Cd2+ and Zn2+ sorption on apatite in the presence of EDTA and humic substanceK. Viipsi, S. Sjöberg, K. Tõnsuaadu and A. ShchukarevE3S Web of Conferences, 1 (2013) 01008DOI: https://doi.org/10.1051/e3sconf/20130101008