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Yang et al. 2004
Yang, K., Zhu, L., Lou, B. and Chen, B. (2004). Significance of natural organic matter in nonlinear sorption of 2,4-dichlorophenol onto soils/sediments. Water Resources Research 40: doi: 10.1029/2003WR002526. issn: 0043-1397.

Sorption of 2,4-dichlorophenol (2,4-DCP) onto 17 lake/river sediments, one red soil, pure minerals, and humic acid was comparatively studied. The isotherms of 2,4-DCP onto soil/sediment samples and humic acid are notably nonlinear at low concentrations and can be described by a simple dual-mode model: qe = KpCe + Q0bCe/(1 + bCe). No significant sorption of 2,4-DCP on pure minerals (montmorillonite and amorphous silicon oxide) was detected. Strong correlations of natural organic matter content to model parameters Kp, Q0, and Q0b were observed, while no significant effects of soil/sediment specific surface area and total clay content on sorption were observed. It is hypothesized that most of the nonlinear sorption behavior can be attributed to the soil/sediment organic matter contents as opposed to mineral contents because of the predominance of strongly hydrated cations (e.g., Na+, Ca2+, Al3+, Mg2+) in natural waters. The treatment of K*oc (K*oc = Kp/foc), Qoc (Qoc = Q0/foc), and Loc (Loc = Q0b/foc) as constants for a given solute represents an important step toward establishing a quantitative relationship between nonlinear sorption and solute molecular structure and offers a way to approximately calculate the nonlinear sorption from soil/sediment foc.

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Abstract

Keywords
Geochemistry, Organic geochemistry, Geochemistry, Geochemical cycles, Geochemistry, Chemical evolution, Hydrology, Surface water quality, soils/sediments, 2,4-DCP, sorption, partition
Journal
Water Resources Research
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Publisher
American Geophysical Union
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