Actinides in the Environment by Arnold M. Friedman (Eds.)

By Arnold M. Friedman (Eds.)

content material: The function of actinide habit in waste administration / John W. Bartlett --
Moisture and solute delivery in porous media / Merlin L. Wheeler --
The migration of plutonium and americium within the lithosphere / S. Fried, A.M. Friedman, J.J. Hines, R.W. Atcher, L.A. Quarterman, and A. Volesky --
organic pathways and chemical habit of plutonium and different actinides within the setting / Roger C. Dahlman, Ernest A. Bondietti, and L. Dean Eyman --
program of the field version conception to the geophysical delivery of PuO₂ : geochemistry of Pu(NO₃)₄ / A.T. Jakubick --
Oklo, an test in long term geologic garage / E.A. Bryant, G.A. Cowan, W.R. Daniels, and W.J. Maeck.

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Furthermore, Pu(V), an analog species of Np(V), has been postulated to be the dominant soluble Pu species in natural waters (19). Plutonium Oxidation State Studies Plutonium can exist simultaneously in four oxidation states in a c i d i c , aqueous solutions. A l l four oxidation state species [Pu(III), Pu(IV), Pu(V), and Pu(VI)] can be present in solution to give thermodynamically stable systems (17). At environmental a c i d i t i e s , Pu(III) i s probably unstable to oxTSation (20); thus, the three higher oxidation states are more l i k e l y to 5?

5 cm free column vol­ ume). The outer c y l i n d r i c a l surface was waxed to render i t impervious and the cylinder then waxed into the end of a glass tube as shown in Fig. 19. 5 χ 10^ c/m P u was applied to the top of the column of rock over a twelve-hour period and a l ­ lowed to dry. 8 cm length of rock by pas­ sing water through the system. This elution was carried out over an eight-week period using 2500 ml of water during the process (1000 free column volumes). This corresponds to a rate of about 52 meters a year for the rate of advance of the water through the stone.

Water was the elution medium, and, since the pump was constructed to deliver predetermined volumes at a slow, steady rate, i t was well suited for this kind of experiment. After the requisite amount of water had been allowed to flow over the surface of the basalt, the flow was stopped and the basalt tablet was removed from i t s holder and dried. ; ACS Symposium Series; American Chemical Society: Washington, DC, 1976. 26 ACTINIDES IN T H E E N V I R O N M E N T the surface of the rock for alpha a c t i v i t y by means of the scan­ ning alpha counter (SADSAC) delineated the distribution of the plutonium on the rock.

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