Open AccessEXAFS investigation of the interaction of hafnium and thorium with humic acid and Bio‐Rex 70
Author(s) -
Denecke M. A.,
Bublitz D.,
Kim J. I.,
Moll H.,
Farkes I.
Publication year - 1999
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049598013478
Subject(s) - thorium , hafnium , extended x ray absorption fine structure , humic acid , chemistry , radiochemistry , geochemistry , environmental chemistry , actinide , nuclear chemistry , inorganic chemistry , geology , physics , nuclear physics , absorption spectroscopy , uranium , organic chemistry , zirconium , fertilizer , quantum mechanics
The interaction of hafnium(IV) and thorium(iv) with humic acid, HA, is studied using EXAFS and compared to the interaction of these metal ions with carboxylate groups of the cation exchanger Bio-Rex70. Fourier-f'fltered Hf and Th I-,3 edge transmission EXAFS for the first oxygen shell is analyzed. For both Hf(IV)- HA and Hf(IV)-Bio-Rex70, in wet paste and air-dried forms, 6-7 oxygen atoms at R=2.14 A are found. Th(IV)-HA also exhibits coordination similar to Th(IV)-Bio-Rex70. These observations support conclusions from previous studies on U(VI)-HA that metal cations are sorbed primarily onto HA carboxylate groups; other HA functional groups play a less significant role