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Science 15 July 1983:
Vol. 221. no. 4607, pp. 271 - 273
DOI: 10.1126/science.221.4607.271
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Articles

Neptunium and Americium Speciation in Selected Basalt, Granite, Shale, and Tuff Ground Waters

JESS M. CLEVELAND 1, TERRY F. REES 1, and KENNETH L. NASH 1

1 U.S. Geological Survey, Denver, Colorado 80225

Neptunium and americium are relatively insoluble in ground waters containing high sulfate concentrations, particularly at 90°C. The insoluble neptunium species is Np(IV); hence reducing waters should enhance its formation. Americium can exist only in the trivalent state under these conditions, and its solubility also should be representative of that of curium.

Submitted on November 12, 1982
Revised on March 21, 1983

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Science. ISSN 0036-8075 (print), 1095-9203 (online)