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Synergistic role of different soil components in slow sorption kinetics of polar organic contaminants.

Environmental pollution (Barking, Essex : 1987) (2013-09-21)
Dongmei Zhang, Lei Hou, Dongqiang Zhu, Wei Chen
ABSTRACT

We observed that the sorption kinetics of nitrobenzene and 2,4-dinitrotoluene (two model polar compounds) was significantly slower than that of 1,4-dichlorobenzene and phenanthrene (two model apolar compounds). The difference was attributable to the strong non-hydrophobic interactions between the polar molecules and soil. Interestingly, sorption kinetics of the polar sorbates to the soil organic matter-free soil, humic/fulvic acid-free soil, and extracted humic acids was very fast, indicating that different soil components played a synergetic role in the observed slow kinetics. We propose that slow sorption kinetics of highly polar sorbates stems mainly from the strong specific interactions (H-bonding, electron donor-acceptor interactions, etc.) with humic/fulvic acids; such specific interactions occur when sorbate molecules diffuse through humic/fulvic acids coiled, in relatively compressed confirmations, within the complex, tortuous, and porous soil matrices formed by mineral grains/particles and soil organic matter.

MATERIALS
Product Number
Brand
Product Description

Supelco
Phenanthrene solution, certified reference material, 5000 μg/mL in methanol
Supelco
2,4-Dinitrotoluene, analytical standard
Sigma-Aldrich
2,4-Dinitrotoluene, 97%
Supelco
1,4-Dichlorobenzene solution, certified reference material, 5000 μg/mL in methanol
Supelco
2,4-Dinitrotoluene solution, 10 mg/mL in acetonitrile, ampule of 5 mL, certified reference material, Cerilliant®
Sigma-Aldrich
1,4-Dichlorobenzene, ≥99%
Sigma-Aldrich
Phenanthrene, 98%
Supelco
1,4-Dichlorobenzene, PESTANAL®, analytical standard
Supelco
Nitrobenzene, PESTANAL®, analytical standard
Sigma-Aldrich
Nitrobenzene, ReagentPlus®, 99%
Sigma-Aldrich
Nitrobenzene, ACS reagent, ≥99.0%
Sigma-Aldrich
Phenanthrene, sublimed grade, ≥99.5%
Supelco
Phenanthrene, analytical standard, for environmental analysis
Supelco
Nitrobenzene solution, certified reference material, 5000 μg/mL in methanol
Supelco
Phenanthrene, certified reference material, TraceCERT®