Fig. 1. (a) Ferricyanide and (b) ferrocyanide sorption in soil horizons containing >10 g C_org kg^-1 (#01 C; #02 E; #03 Bsh; #04 stagnic 2Bg; #05 Bw; #06 gleyic Bg; #07 BC; #08 ferralic B; #09 stagnic Bg). Isotherms are plotted following Eq. [1].

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