TY - JOUR
T1 - Interaction of phenanthrene and its primary metabolite (1-hydroxy-2- naphthoic acid) with estuarine sediments and humic fractions
AU - Parikh, Sanjai J.
AU - Chorover, Jon
AU - Burgos, William D.
N1 - Funding Information:
We acknowledge the assistance of Morris Roberts and George Vadas of the Virginia Institute of Marine Sciences in collecting the estuarine sediments. Thanks also to Dan Jones, Director of the Penn State Intercollegiate Center for Mass Spectrometry, and Arpad Somogyi (Supervisor) and Mark E. Malcomson of the University of Arizona Mass Spectrometry Facility for their assistance in conducting the MS analyses, and to Je-Hun Jang for Mössbauer data collection and analysis. This research was supported by the U.S. Department of Energy, Office of Biological and Environmental Research, Joint Bioremediation Program, Grant DE-FG02-97ER62356 and the National Science Foundation, Grant BES 9010112.
PY - 2004/8
Y1 - 2004/8
N2 - Experiments were conducted to compare the sorption and desorption of phenanthrene and its primary degradation product, 1-hydroxy-2-naphthoic acid (HNA), in estuarine sediment, humic acid (HA) and humin. Ionic composition, ionic strength (0.4 M) and pH (7.6) were employed to mimic native estuarine pore water at the sediment-water interface. Sorption to whole sediment and organic matter (OM) fractions was significantly lower for HNA than for phenanthrene. Whereas HNA did not sorb to HA, uptake to sediment and humin was observed, suggesting that HNA does not bind directly to OM. Phenanthrene uptake was characterized by hysteretic behavior and exhibited slow desorption. In contrast, HNA initially was more readily desorbed from sediment and humic fractions, but a significant fraction was not recovered in repeated desorption runs. The lower sorption of HNA reflects its greater polarity and water solubility, but the consistent retention of a non-desorbing fraction suggests strong binding and/or chemical transformation reactions may be important. It was postulated that abiotic transformation of HNA may occur in estuarine sediments, in part due to the presence of redox active minerals (Fe(III) and Mn(IV) oxides). The presence of Fe and Mn solids in the estuarine sediment was verified by sequential extraction and studies were then conducted to investigate the transformation of HNA in the presence of synthetic goethite (α-FeOOH) and birnessite (δ-MnO2) as model solids. Reaction with birnessite led to transformation of all HNA in solution within 24 h and resulted in the formation of partial oxidation products (POPs). Following reaction with goethite, HNA was present in solution and POPs were observed in the weakly bound fraction. This study indicates that degradation products of polycyclic aromatic hydrocarbons (PAHs) may have distinctly different sorption affinities and reactivities toward environmental surfaces than their parent compounds.
AB - Experiments were conducted to compare the sorption and desorption of phenanthrene and its primary degradation product, 1-hydroxy-2-naphthoic acid (HNA), in estuarine sediment, humic acid (HA) and humin. Ionic composition, ionic strength (0.4 M) and pH (7.6) were employed to mimic native estuarine pore water at the sediment-water interface. Sorption to whole sediment and organic matter (OM) fractions was significantly lower for HNA than for phenanthrene. Whereas HNA did not sorb to HA, uptake to sediment and humin was observed, suggesting that HNA does not bind directly to OM. Phenanthrene uptake was characterized by hysteretic behavior and exhibited slow desorption. In contrast, HNA initially was more readily desorbed from sediment and humic fractions, but a significant fraction was not recovered in repeated desorption runs. The lower sorption of HNA reflects its greater polarity and water solubility, but the consistent retention of a non-desorbing fraction suggests strong binding and/or chemical transformation reactions may be important. It was postulated that abiotic transformation of HNA may occur in estuarine sediments, in part due to the presence of redox active minerals (Fe(III) and Mn(IV) oxides). The presence of Fe and Mn solids in the estuarine sediment was verified by sequential extraction and studies were then conducted to investigate the transformation of HNA in the presence of synthetic goethite (α-FeOOH) and birnessite (δ-MnO2) as model solids. Reaction with birnessite led to transformation of all HNA in solution within 24 h and resulted in the formation of partial oxidation products (POPs). Following reaction with goethite, HNA was present in solution and POPs were observed in the weakly bound fraction. This study indicates that degradation products of polycyclic aromatic hydrocarbons (PAHs) may have distinctly different sorption affinities and reactivities toward environmental surfaces than their parent compounds.
KW - Humic acid
KW - Humin
KW - Hydroxynaphthoic acid
KW - Oxidative transformation
KW - Phenanthrene
KW - Sediment
KW - Sorption
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U2 - 10.1016/j.jconhyd.2003.10.004
DO - 10.1016/j.jconhyd.2003.10.004
M3 - Article
C2 - 15240164
AN - SCOPUS:3042758477
SN - 0169-7722
VL - 72
SP - 1
EP - 22
JO - Journal of Contaminant Hydrology
JF - Journal of Contaminant Hydrology
IS - 1-4
ER -