title: A Study on Sorption of (226)Ra on Different Clay Matrices.
abstract: The sorption of radium 226 ((226)Ra) on different clay materials (bentonite, illite and a mixture of bentonite-illite) was studied. Clay materials are used in the construction of disposal pits for technically enhanced naturally occurring radioactive materials (TENORM) wastes (i.e., contaminated soil and sludge) generated by the oil and gas industry operations. Experimental conditions (pH, clay materials quantity, and activity concentrations of (226)Ra) were changed in order to determine the optimal state for adsorption of (226)Ra. The results showed that the concentration of adsorbed (226)Ra on clay materials increased with time to reach an equilibrium state after approximately 5 h. More than 95 % of the radium was adsorbed. The mixture of bentonite-illite (1/9) exhibited the greatest adsorption of radium under all experimental conditions.
authors.affiliation: Department of Protection and Safety, Atomic Energy Commission of Syria, P.O. Box 6091, Damascus, Syria.
authors.forename: E
authors.initials: E
authors.lastname: Alhajji
authors.affiliation: Department of Protection and Safety, Atomic Energy Commission of Syria, P.O. Box 6091, Damascus, Syria. prscientific1@aec.org.sy.
authors.forename: M S
authors.initials: MS
authors.lastname: Al-Masri
authors.affiliation: Department of Protection and Safety, Atomic Energy Commission of Syria, P.O. Box 6091, Damascus, Syria.
authors.forename: H
authors.initials: H
authors.lastname: Khalily
authors.affiliation: Department of Protection and Safety, Atomic Energy Commission of Syria, P.O. Box 6091, Damascus, Syria.
authors.forename: B E
authors.initials: BE
authors.lastname: Naoum
authors.affiliation: Department of Protection and Safety, Atomic Energy Commission of Syria, P.O. Box 6091, Damascus, Syria.
authors.forename: H S
authors.initials: HS
authors.lastname: Khalil
authors.affiliation: Department of Protection and Safety, Atomic Energy Commission of Syria, P.O. Box 6091, Damascus, Syria.
authors.forename: A
authors.initials: A
authors.lastname: Nashawati
mesh_terms: D065966:Absorption, Physicochemical; D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry*; D001546:Bentonite / Q000737:chemistry; D000077215:Clay; D008903:Minerals / Q000737:chemistry; D008956:Models, Chemical; D011883:Radium / Q000737:chemistry*; D012722:Sewage; D014875:Water Pollutants, Radioactive / Q000032:analysis / Q000737:chemistry*
chemical_list: D000538:Aluminum Silicates; D008903:Minerals; D012722:Sewage; D014875:Water Pollutants, Radioactive; C099089:illite; D001546:Bentonite; D000077215:Clay; D011883:Radium
keywords: Bentonite; Illite; Radium; Syrian oilfields; TENORM