Sorption kinetics of selected volatile organic compounds in humin
Journal
Environmental Toxicology and Chemistry
Journal Volume
21
Journal Volume
21
Journal Issue
10
Journal Issue
10
Pages
2067-2074
Start Page
2067
End Page
2074
ISSN
07307268
Date Issued
2002-10
Author(s)
Abstract
Each component of the chemically heterogeneous soil exhibits a unique sorption behavior toward organic sorbates. The sorption kinetics of some volatile organic compounds (VOCs) in pressed humin disks was investigated by tracking the weight change of the disks with a microbalance. Higher sorbing capacity for more polar VOCs as well as C13 nuclear magnetic resonance data indicates that humin was more hydrophilic than Aldrich humic acid (Milwaukee, WI, USA). The apparent diffusivity of acetone, toluene, and hexane in the disks ranged from 10-8 to 10-10 cm2/s. The sorbed toluene in humin does not seem persistent to desorption; however, acetone and hexane, either as polar or linear compounds in humin, show persistence against desorption. On completion of the desorption experiments, there were approximately 35 and 20% sorbate residue for acetone and hexane, respectively.
Subjects
Diffusivity
Humin
Sorption
Volatile organic compounds
SDGs
Publisher
SETAC Press
Type
journal article