Sorption characteristics of N-acyl homserine lactones as signal molecules in natural soils based on the analysis of kinetics and isotherms.Quorum sensing, the communication between microorganisms, is mediated by specific diffusible signal molecules.  The adsorption isotherms of AHLs could be described by the Langmuir and Freundlich equation (R 2 ≥ 0.98), indicating that the sorption process involved monolayer sorption and heterogeneous energetic distribution of active sites on the surfaces of the soils.  The thermodynamic parameter, Gibbs free energy (ΔG), and a dimensionless parameter showed that the sorption of AHLs was mainly dominated by physical adsorption. 
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