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Fig. 5. Comparison of sequential extraction profiles performed with and without hydroxylamine–HCl (HA) for (a) U and (b) Ni. Arrows indicate apparent redistributions of U and Ni to subsequent extraction stages following omission of HA step. Sequential extractions with HA step were performed in duplicate only (n = 2). Cumulative metal concentrations extracted are presented in Table 6. Error bars are one standard deviation (n = 3) for non-HA sequential extraction. Legend applies to both graphs.
