Abstract

The nature of cation substitution during replacement of calcite by phosphorite allows the statistical treatment of data concerning such substitutions. Log probability plots of data yield straight lines that allow easy and accurate extrapolations. Data are presented to show the effect of PO 4 (super -3) concentration, temperature, flow rate, and Na (super +) concentration on the primary inclusion of the radioisotopes of Pm (super +3) , Sr (super +2) , U V1 , and Pu 1V .

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