Inference
of Organophosphate Ester Emission History
from Marine Sediment Cores Impacted by Wastewater Effluents
Version 2 2019-07-22, 14:15
Version 1 2019-07-22, 14:06
Posted on 2019-07-22 - 14:15
Organophosphate
esters (OPEs) have been in use as flame retardants
for many decades, with their actual usage varying over time. Knowledge
of the emission history of OPEs is valuable for improving our prediction
of their environmental loadings and associated risks. In this study,
concentrations and compositions of 10 OPEs were measured in three
dated sediment cores from the Palos Verdes Shelf (PVS) off the coast
of Los Angeles, which has been impacted by wastewater treatment plant
(WWTP) effluents for over a century. The total OPE concentrations
varied from 0.68 to 1064 ng/g along the sediment profile, with two
apparent peaks. The first peak occurred in the 1970s, coinciding with
peak emissions from WWTPs. The second peak appeared in the 2000s and
was possibly attributed to increased consumption of OPEs as replacement
flame retardants. Since downward movement of OPEs in the PVS sediment
bed was retarded by their slow desorption, the reconstructed history
likely provided an accurate picture of OPE emissions in Southern California
and North America. These findings suggest that the near-shore marine
sediments affected by WWTP effluents could serve as an environmental
proxy documenting history in OPE use and emissions.
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Li, Jun; Wang, Jie; Taylor, Allison R.; Cryder, Zachary; Schlenk, Daniel; Gan, Jay (2019). Inference
of Organophosphate Ester Emission History
from Marine Sediment Cores Impacted by Wastewater Effluents. ACS Publications. Collection. https://doi.org/10.1021/acs.est.9b01713
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AUTHORS (6)
JL
Jun Li
JW
Jie Wang
AT
Allison R. Taylor
ZC
Zachary Cryder
DS
Daniel Schlenk
JG
Jay Gan
KEYWORDS
OPE useOPE concentrationsflame retardantsemission historyreplacement flame retardantsPalos Verdes Shelfpeak emissionssediment coresLos AngelesWWTP effluentssediment profile10 OPEsMarine Sediment Cores ImpactedWastewater Effluents Organophosphate estersOrganophosphate Ester Emission HistoryOPE emissionsnear-shore marine sedimentsSouthern CaliforniaPVS sediment bedwastewater treatment plant