title: Neptunium and americium speciation in selected basalt, granite, shale, and tuff ground waters.
abstract: Neptunium and americium are relatively insoluble in ground waters containing high sulfate concentrations, particularly at 90 degrees 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.
authors.forename: J M
authors.initials: JM
authors.lastname: Cleveland
authors.forename: T F
authors.initials: TF
authors.lastname: Rees
authors.forename: K L
authors.initials: KL
authors.lastname: Nash