Fig. 6. Sequential extraction results for Steed Pond sediments for (a) U, (b) Ni, (c) Fe, (d) Mn, and (e) Al. Sequential extractions were performed without hydroxylamine–HCl (HA) step. Data columns within each sequential extraction fraction are presented by increasing sediment organic carbon content (i.e., SP2B1, SP1B2, SP1B1, and SP5B1). Cumulative metal concentrations extracted are presented in Table 6. Error bars are one relative standard deviation (n = 3). Legend applies to all graphs.