Water schist-equilibrated

Rock-equilibrated water was produced by allowing distilled water to be in contact with granulated gray hornblende schist for a period of several days. The solution produced was filtered through a 0.4 pm NUCLEPORE filter before use. Analysis of the resulting solution showed that rock equilibrated-water contained 48 mg/L total solids (dried at 180°C). The E of the solution was measured to be 0.275 V. The pH of the gray hornblende schist equilibrated water was measured to be 7.6 at the time of the first adsorption experiment. Thereafter the solution pH was maintained at 7.5-7.7. 

Before the elution experiments were performed, the "schist"-equilibrated water was pumped through the fissures for two days to allow the fissure walls to interact with the rock-equilibrated water. 

Figures 6, 8, and 10 show that the distributions of americium on the fissure surfaces after the addition of 0.67 fissure volumes of stock solution followed by the elution of 20 fissure volumes of "schist -equilibrated water through the fissures at flow rates of 1.13, 2.29, and 4.77 cm/hr. A comparison was made between the americium distributions found on the fissure surfaces after the addition of americium stock solution and that found after elution of the americium by 20 fissure volumes of "schist"-equilibrated water. It was found that after the initial loading of americium into the fissures in the first 0.67 fissure volumes of solution, the peak concentrations of americium that were sorbed at the top of the fissures decreased in their relative concentration. The leading edges of the detectable nuclide concentration extending into the fissures had increased in length and relative concentration with subsequent elution by rock equilibrated water through the fissures. The ARDISC model predicted the same relationships.

Equilibrium Partitioning Experiments. The equilibrium partitioning of americium-III between gray hornblende schist and rock equilibrated water was determined in batch partitioning experiments with rectangular blocks of gray hornblende schist ( 5). The surface area sorption coefficient, K, was determined to be 4.5 . 5 mL/cm where... 

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See also in sourсe #XX -- [ ]

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