+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ PDF Full Text
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Translate
+ Recently Requested

Enhanced binding of hydrophobic organic contaminants by microwave-assisted humification of soil organic matter

Enhanced binding of hydrophobic organic contaminants by microwave-assisted humification of soil organic matter

Chemosphere 93(11): 2704-2710

Enhanced binding of hydrophobic organic contaminants (HOCs) with soil organic matter (SOM) by microwave (MW) irradiation was investigated in this study. We used fluorescence excitation emission matrix, humification index (HIX), and organic carbon partitioning coefficient (Koc) to examine characteristic changes in SOM and its sorptive capacity for HOCs. When MW was irradiated to soils, protein-like fluorescence decreased but fulvic- and humic-like fluorescence increased. The addition of activated carbon in the presence of oxygen facilitated the humification-like alteration of SOM more significantly, evidenced by increases in fulvic- and humic-like fluorescence signals. The extent of SOM-phenanthrene binding also increased with MW treatment, supported by a notable increase in Koc value from 1.8×10(4) to 7.3×10(5)Lkg(-1). Various descriptors indicating the physical and chemical properties of SOM along with the relative percentage of humic-like fluorescence and HIX values demonstrated strong linear relationships with Koc values. These linear relationships indicated that the increased binding affinity of SOM for phenanthrene was attributed to enhanced SOM humification, which was stimulated by MW irradiation. Thus, our results demonstrate that MW irradiation could be effectively used for remediation or for assessing the environmental risks of HOC-contaminated soils and groundwater.

(PDF emailed within 0-6 h: $19.90)

Accession: 052982319

Download citation: RISBibTeXText

PMID: 24050718

DOI: 10.1016/j.chemosphere.2013.08.073

Related references

Artificial and enhanced humification of soil organic matter using microwave irradiation. Environmental Science and Pollution Research International 20(4): 2362-2371, 2013

Reevaluation of general partitioning model for sorption of hydrophobic organic contaminants by soil and sediment organic matter. Environmental Toxicology and Chemistry 18(8): 1617-1626, 1999

Hysteresis in the sorption and desorption of hydrophobic organic contaminants by soils and sediments; 2, Effects of soil organic matter heterogeneity. Journal of Contaminant Hydrology 31(1-2): 149-165, 1998

Formation of recalcitrant organic matter: Humification dynamics of algal derived dissolved organic carbon and its hydrophobic fractions. Marine Chemistry 51(3): 193-199, 1995

Sorption of hydrophobic contaminants to soil organic matter. Abstracts of Papers - American Chemical Society, National Meeting 216: GEOC 020, 1998

Characteristics of soil organic matter in temperate soils by Curie point pyrolysis-mass spectrometry. I. Organic matter variations with drainage and mull humification in A horizons. Journal of Soil Science 35(4): 549-558, 1984

Mobilization of hydrophobic contaminants from soils by enzymatic depolymerization of soil organic matter. Chemosphere 78(8): 996-1003, 2010

The role of condensed organic matter in the nonlinear sorption of hydrophobic organic contaminants by a peat and sediments. Journal of Environmental Quality 31(6): 1953-1962, 2002

Essential characteristics of natural dissolved organic matter affecting the sorption of hydrophobic organic contaminants. Aquatic Sciences 66(2): 171-177, 2004

Synergistic Effects of Organic Contaminants and Soil Organic Matter on the Soil-Water Partitioning and Effectiveness of a Nonionic Surfactant (Triton X-100). Bioremediation Journal 12(2): 88-97, 2008

Characterization of soil organic matter using microwave assisted acid and base hydrolysis. Organic Geochemistry 65: 103-117, 2013

Binding of organic ligands with Al(III) in dissolved organic matter from soil: implications for soil organic carbon storage. Environmental Science and Technology 46(11): 6102-6109, 2012

Geosorbent organic matter and its relationship to the binding and sequestration of organic contaminants. Colloids and Surfaces A: Physicochemical and Engineering Aspects 151(1-2): 167-179, 1999

Sorption of polar and nonpolar organic contaminants onto soil with various organic matter. Geophysical Research Abstracts 2(2000, 2000

A potential link between the turnover of soil organic matter and the release of aged organic contaminants. Environmental Toxicology and Chemistry 22(4): 760-766, 2003