Sorption isotherms and Langmuir fits of organic carbon compounds on different soil orders.

<p>(A) D-Glucose, (B) L-Alanine, (C) Salicylic acid, (D) Sinapyl alcohol and (E) Oxalic acid. Each isotherm per soil order is an average of three soils except for Mollisols in (E) where only one soil type (Longford) is considered. Symbols correspond to measured sorption and lines correspond to Langmuir model predicted sorption.