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Concentrations of total (a) acetate, (b) Fe(II), and (c) arsenic speciation [As(V)/As(III)], derived as percentages of the total As within individual sediment pellets (assessed via XANES analysis) incubated with (○) 10 mM acetate or (▵) 10 mM acetate and 10 mM sodium-arsenate or (▴) not amended. Bars show 1× SE for three replicates.
