Interaction of actinides with aluminosilicate colloids in statu nascendi: Part II: spectroscopic speciation of colloid-borne actinides(III)

摘要: Abstract The chemical interaction of trivalent actinides, Am(III) and Cm(III) in the process hydroxy aluminosilicate (HAS) colloid formation is investigated by time-resolved laser fluorescence spectroscopy (TRLFS) with assistance radiometry. A screening experiment performed at beginning to ascertain under what conditions HAS colloids are formed favourably incorporate actinides their oxo-bridge structure. While keeping Si concentration constant 10−3 mol l−1, Al varied from 10−7 l−1 pH range 4 9. electrolyte medium made 0.03 M NaCl. trace amount 241Am or 248Cm introduced a 4.9×10−8 l−1. favourable condition as ascertained radiometric found be around 5 10−6–10−5 for marginal pH≥7 10−6–10−4 major amount. Spectroscopic speciation on Cm, its high yield, various experimental solutions appraisal binding within oxo-bridges colloids. Speciation TRLFS shows two colloid-borne Cm species, Cm-HAS(I) Cm-HAS(II), which have seven six hydration water molecules, respectively. These results put forward conclusion that former undergoes bidentate latter tridentate binding. In absence Al, reaction silanol moieties form Cm–silicate complexes, distributed three phases: ionic phase, precipitate. However, due low concentration. Applying laser-induced breakdown detection (LIBD), an average size 11–13 nm hard sphere diameter different pH.