title: Analysis of uranium in the insoluble residues after decomposition of soil samples by various techniques.
abstract: A comparison of different dissolution techniques for determination of uranium in soil samples was made. Conventional wet dissolution with mixtures of HNO3, HClO4 and HF acids, microwave dissolution using HNO3 and HF, and alkaline fusion with Na2CO3 and Na2O2 were evaluated. For testing the effectiveness of the dissolution procedures, two reference materials and six soil samples from the surroundings of a former uranium mine were investigated. It was observed that the content of uranium in the residues determined by INAA represents a significant contribution to its total concentration in the sample, especially in the case of microwave dissolution.
authors.affiliation: University of Ljubljana, Faculty of Chemistry and Chemical Technology, Aškerčeva 5, SI-1000 Ljubljana, Slovenia.
authors.forename: S
authors.initials: S
authors.lastname: Jurečič
authors.affiliation: Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia. Electronic address: ljudmila.benedik@ijs.si.
authors.forename: L
authors.initials: L
authors.lastname: Benedik
authors.affiliation: Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia.
authors.forename: P
authors.initials: P
authors.lastname: Planinšek
authors.affiliation: Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia.
authors.forename: M
authors.initials: M
authors.lastname: Nečemer
authors.affiliation: Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia.
authors.forename: P
authors.initials: P
authors.lastname: Kump
authors.affiliation: University of Ljubljana, Faculty of Chemistry and Chemical Technology, Aškerčeva 5, SI-1000 Ljubljana, Slovenia.
authors.forename: B
authors.initials: B
authors.lastname: Pihlar
keywords: Decomposition; INAA; Residue; Soil; Uranium