Complexation of Cm(III) with aqueous silicic acid
作者： Petra J. Panak , M. A. Kim , R. Klenze , Jae-Il Kim , Thomas Fanghänel
DOI: 10.1524/RACT.93.3.133.61616
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摘要: The complexation of 2 4 8 Cm(III) with aqueous silicic acid is investigated in the pH range 1.5-9.0 0.03 M NaCI varying silicate concentration under and over saturation reference to solubility amorphous silica order characterize reaction monosilicic polysilicic acid. Speciation made by time-resolved laser fluorescence spectroscopy (TRLFS) combination radiometric quantification. Three different products are observed: Cm-silicate(I), Cm-silicate(II) Cm-silicate(III). first second species formed under-saturation acid, whereas all three produced over-saturation formation Cm-silicate(I) following Cm 3 + H SiO - appears both only as a minor fraction at = 4-7. Cm-silicate(III) found be colloidal. shows its spectroscopic characteristics experimental condition, exclusively remains consistent stable. results indicate that conversion takes place → increasing silicon concentration. Only leading can quantified for stability constant log β° 7.74′0.08.
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