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On the linear driving force model for sorption kinetics of organic compounds on suspended sediment particle
Author(s) -
Valsaraj Kalliat T.,
Thibodeaux Louis J.
Publication year - 1999
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620180811
Subject(s) - sorption , partition coefficient , particle (ecology) , aqueous solution , kinetics , chemistry , sediment , mass transfer , particle size , environmental chemistry , thermodynamics , chromatography , chemical engineering , organic chemistry , adsorption , geology , paleontology , oceanography , physics , quantum mechanics , engineering
Sorption kinetics of hydrophobic organic compounds on suspended sediments in the water column are analyzed using the linear driving force (LDF) model. The LDF model succinctly captures the different mass transfer resistances for uptake by aqueous suspended particles. The LDF model is appropriate for those situations where both water‐ and particle‐side processes are important. It is shown that departure from equilibrium sorption may be responsible for the near constancy in experimental sorption coefficients obtained for strongly hydrophobic compounds towards aqueous suspended particles in the sedimentary environment. The time to equilibrium for sorption diminishes with decreasing particle radius and increases with increasing compound hydrophobicity. For strongly hydrophobic compounds, the apparent partition coefficient is shown to be inversely proportional to the suspended solids concentration when sorption is far from equilibrium.