TY - JOUR
T1 - Sorption of organic pollutants by marine sediments
T2 - Implication for the role of particulate organic matter
AU - Yu, Zhiqiang
AU - Huang, Weilin
AU - Song, Jianzhong
AU - Qian, Yaorong
AU - Peng, Ping'an
N1 - Funding Information:
This study was funded by National Science Foundation (BES-0404487) and National Research Initiative Competitive Grant No. 2001-35107-11129 from the USDA Cooperative State Research, Education, and Extension Service. Partial funding was also provided by the Natural Science Foundation of China through the International Young Investigator Program (40128002) to WH and Chinese Natural Science Foundation (40102009) to ZY.
PY - 2006/12
Y1 - 2006/12
N2 - The objective of this study was to quantify sorption properties for kerogen/black carbon (BC)-bearing sediments. Single-solute sorption isotherms were measured for five pristine marine sediments using phenanthrene, naphthalene, 1,3,5-trichlorobenzene, and 1,4-dichlorobenzene as the sorbates. The results showed that the sorption isotherms were nonlinear and that the organic carbon normalized single point KOC values were comparable to those reported in the literature for the purified keorgen and BC, but are much higher than the data reported for HA and kerogen/BC-containing terrestrial soils and sediments. It is likely that koergen and BC associated with these pristine marine sediments may not be encapsulated with humic acids or Fe and Mn oxides and hydroxides as often do in terrestrial soils and sediments. As a result, they may be fully accessible to sorbing molecules, exhibiting higher sorption capacities. The study suggests that competition from background HOCs and reduced accessibility when kerogen and BC are associated with terrestrial sediments may dramatically increase variability of sorption reactivities of geosorbents. Such variability may lead to large uncertainties in the prediction of sorption from the contents of kerogen and/or BC along with TOC.
AB - The objective of this study was to quantify sorption properties for kerogen/black carbon (BC)-bearing sediments. Single-solute sorption isotherms were measured for five pristine marine sediments using phenanthrene, naphthalene, 1,3,5-trichlorobenzene, and 1,4-dichlorobenzene as the sorbates. The results showed that the sorption isotherms were nonlinear and that the organic carbon normalized single point KOC values were comparable to those reported in the literature for the purified keorgen and BC, but are much higher than the data reported for HA and kerogen/BC-containing terrestrial soils and sediments. It is likely that koergen and BC associated with these pristine marine sediments may not be encapsulated with humic acids or Fe and Mn oxides and hydroxides as often do in terrestrial soils and sediments. As a result, they may be fully accessible to sorbing molecules, exhibiting higher sorption capacities. The study suggests that competition from background HOCs and reduced accessibility when kerogen and BC are associated with terrestrial sediments may dramatically increase variability of sorption reactivities of geosorbents. Such variability may lead to large uncertainties in the prediction of sorption from the contents of kerogen and/or BC along with TOC.
KW - Black carbon
KW - Desorption hysteresis
KW - Hydrophobic organic pollutants
KW - Kerogen
KW - Sedimentary organic matter
KW - Sorption
UR - http://www.scopus.com/inward/record.url?scp=33750996720&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33750996720&partnerID=8YFLogxK
U2 - 10.1016/j.chemosphere.2006.04.036
DO - 10.1016/j.chemosphere.2006.04.036
M3 - Article
C2 - 16777187
AN - SCOPUS:33750996720
SN - 0045-6535
VL - 65
SP - 2493
EP - 2501
JO - Chemosphere
JF - Chemosphere
IS - 11
ER -