DETERMINATION OF TRACE-ELEMENTS BY INSTRUMENTAL NEUTRON-ACTIVATION ANALYSIS IN ANATOLIAN BENTONITIC CLAYS

Citation
N. Gungor et al., DETERMINATION OF TRACE-ELEMENTS BY INSTRUMENTAL NEUTRON-ACTIVATION ANALYSIS IN ANATOLIAN BENTONITIC CLAYS, Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 142(4), 1998, pp. 555-560
Citations number
14
Categorie Soggetti
Instument & Instrumentation","Nuclear Sciences & Tecnology","Physics, Atomic, Molecular & Chemical","Physics, Nuclear
ISSN journal
0168583X
Volume
142
Issue
4
Year of publication
1998
Pages
555 - 560
Database
ISI
SICI code
0168-583X(1998)142:4<555:DOTBIN>2.0.ZU;2-S
Abstract
Instrumental Neutron Activation Analysis (INAA) was carried out for th e determination of trace elements in nonswelling type bentonitic clays . Samples were irradiated in Triga Mark II type of reactor at the Nucl ear Institute of Technical University of Istanbul. Irradiation was per formed in two steps for ''short and long lived'' isotopes. The gamma s pectra of short lived isotopes were interpreted with respect to Al, Ca , Mg, Na, K, Ti, Mn, V qualitatively and that of long lived isotopes w ith respect to Sc, Cr, Br, Sb, Cs, La, Ce, Sm, Yb, Hf quantitatively. The relative richness of the trace elements (Al, Ti, Ca, Mg, Na, K) ob served in the Sampo 90 program was obtained using Atomic Absorption te chnique by normalizing its value to that of sodium. The silicon conten t of samples was determined by gravimetry. The results indicated that Sample I contained relatively higher amount of REE, Sb, Ca and Na than Sample II. The amount of Sc, Cr and Br were about similar in both sam ples. Concentrations of La, Ce, Sm and Yb are higher than REE abundanc es found in all natural waters. These results suggest that Ca-bentonit e samples are representative of primary deposition environment. In add ition, the Sc content of both the samples indicates that Ca-bentonite deposits originated from continental crust. The relatively high amount of REE might bring about porosity problems in the use of Ca-bentonite in cement and concrete production. (C) 1998 Elsevier Science B.V. All rights reserved.