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Fe(II)/Fe(tot) ratios in different microcosm setups (triplicates shown with triangle, square and diamond symbols). After the initial amendment (5 mM each Fe(II) and Fe(III) in addition to 1 mM derived from the sediment, 2 mM each nitrate and nitrite), microcosms were spiked with nitrate or nitrite at day 60 (see arrows). Nitrate and nitrite consumption of the same experiments are shown in Fig. 2. Fe(tot), total iron.
