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Figure 4 | Geochemical Transactions

Figure 4

From: Reduction of crystalline iron(III) oxyhydroxides using hydroquinone: Influence of phase and particle size

Figure 4

Semiquantitative comparison using the method of initial rates: (a) concentration of Q (in equivalents/L) vs time for experiments using 2.0 g/L 4 nm-6LF and 1.0 mM (black dots), 0.50 mM (dark gray dots), 0.20 mM (light gray dots), and 0.10 mM (white dots) QH2. Solid lines represent the linear regression, which have been extended using a dotted line for clarity, (b) Concentration of Fe(II) vs Q (in equivalents/L) for 2.0 g/L 4 mn-6LF and 1.0 mM QH2. In both (a) and (b), equations listed were generated by linear least-squares regression analysis of the linear portion of the data (solid lines). The y-error bars represent the standard deviation in analyte concentration, and the x bars represent the standard deviation in sampling times for three trials. (c) Log-log plot of d[Q]/dt vs [QH2]0. The slope is the empirical reaction order (m) with respect to QH2 [see Eq. (3)]. (d) Log-log plot of d[Q]/dt vs [S]Fh. The slope is the empirical reaction order (n) with respect to the surface [see Eq. (3)]. In (c) and (d), equations listed were generated by linear least-squares regression analysis of the data (solid lines).

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