Hydrologic Resources Management Program and Underground Test Area Project FY 2000 Progress Report Page: 62 of 156
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120 * Na
Si
100 oCa
OK
80
S60
E
40
20-
0-
J13 ER-20-5 #1 ER-20-5 #3 WW-20
Wells
Figure 8. Comparison of WW-20 cation chemistry with water from ER20-5 (area 20,)
and J-13, NTS
Batch sorption experiments: Three series of experiments were carried out to determine
the effect of time, pH and Pu(IV) concentrations, respectively. For each set of sorption
experiments, a second series of "control" solutions were prepared under the exact same
conditions but in the absence of the colloids. The "controls" were used to monitor any
precipitation or sorption of Pu onto the container and filters during the experiments. If
applicable, the pH adjustment was made by adding 0.1 M HCL or NaOH. Samples and
"controls" were kept in closed polyethylene containers and were gently shaken on an
Environ-Shaker (Lab-Line Instrument, Inc.) with a slow and stable shaking speed (300
rpm), until the equilibrium was reached.
After sorption occurred, a separation of the colloidal phase from the liquid phase was
performed by ultrafiltration using Centricon-30 filters, 4.1 nm pore size (Amicon).
Special attention was made during this step to avoid the presence of any colloids or small
particles in the supernatant that may result in erroneous sorption ratio calculations. The
sorption ratios were calculated using the following equation:
A - A
Sorption% = A""- x100
Where Aunf and Af are the a-activity (cpm/mL) in the unfiltered and filtered samples,
respectively.50
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Davisson, M. L.; Eaton, G. F.; Hakemi, N. L.; Hudson, G. B.; Hutcheon, I. D.; Lau, C. A. et al. Hydrologic Resources Management Program and Underground Test Area Project FY 2000 Progress Report, report, July 1, 2001; California. (https://digital.library.unt.edu/ark:/67531/metadc1411019/m1/62/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.