RT Journal Article T1 Lignitos uraníferos de Calaf: Estudio cinético de lixiviación en medio bicarbonatado T1 Uraniferous lignites from Calaf: Kinetic study of lixiviation in bicarbonate medium A1 Grau i Girona, R. AB Humic acids contained in lignites ha ve hihg capacity to link with uranil ion and other heavy metals. The aim of this paper is to study the uranil-1 ignite link and the determination of the funtional groups which participate in it For that, the complejation of uranium with sodium bicarbonate have been studied and the kinetic equation of the system obtained. Later, through iR spectroscopy the funtional groups participating in the link with the uranil ion have also been obtained PB Sociedad Geológica de España YR 1996 FD 1996 LK http://hdl.handle.net/10272/11089 UL http://hdl.handle.net/10272/11089 LA spa DS Repositorio Institucional de la Universidad de Huelva RD 31 may 2026