caa a22 4500 469110279 CHVBK 20180323133108.0 cr unu---uuuuu 170328e19920601xx s 000 0 eng 10.1007/BF02040723 doi (NATIONALLICENCE)springer-10.1007/BF02040723 Andao Du Institute of Geophysics and Planetary Physics, University of California, 90024, Los Angeles, CA, (USA) aut Radiochemical neutron activation analysis of Cs and Rb in geological samples using zeolite (clinoptilolite) chromatography and sodium tetraphenylborate precipitation [Elektronische Daten] [Du Andao] Three procedures for separating of Cs and Rb from geological samples were investigated. The fractional recovery was determined by radioactive tracers and by RNAA. In the first procedure 0.2 g of irrdiated sample is fused with Na2O2, acidified and passed through a clinoptilolite zeolite column. Cs and Rb were eluted with 7.5M HNO3; chemical yields are in the range 93-98%. The second procedure is a supplement to the SUNDBERG and BOYNTON (1976) procedure; a previously discarded anion-exchanger effluent, containing Cs, Rb, Co, Na, etc., is passed through a clinoptilolite column. Cs and Rb are eluted with 7.5M HNO3; yields are in the range of 82-94%. A third separation involves precipitation of Cs and Rb from the effluent and washings with sodium tetraphenylborate (NaBPh4); yields are 64-83%. Akadùmiai Kiadó, 1992 Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 159/2(1992-06-01), 293-299 0236-5731 159:2<293 1992 159 10967 https://doi.org/10.1007/BF02040723 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02040723 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Andao Du Institute of Geophysics and Planetary Physics, University of California, 90024, Los Angeles, CA, (USA) aut NATIONALLICENCE 773 0- Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 159/2(1992-06-01), 293-299 0236-5731 159:2<293 1992 159 10967 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer