Determination of some rare earth elements, scandium and cobalt in Bulgarian geostandard Granite G-8

The rare elements and scandium was separated by precipitation as oxalates, following by extraction of Sc with TBP. Co was separated by extraction of its diethylditiocarbamate complex with CHCl3. The results obtained were compared with data from INAA (Apostolov and Jordanov, 1976; Rosenberg, 1979), and data from atomic absorption spectrometry and X-ray fluorescence analysis (Ivanov, 1981). The standard reference material Soil-5 of the IAEA was analysed concurrently. The separation procedure for rare earths by oxalate precipitation was more time consuming than the extraction one (Ryabchikov and Ryabukhin, 1966), but in the case of standard material analysis, which is not serial, it seemed the preferable one to be used. The metod allows for separation of rare earthswith less impurities. Undoubt advantage was the use of 144-Ce and 57-Co tracers for the control of chemical yield