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Quantitative Thermodynamic Exposure Assessment (QTEA) Supporting Resilient Contaminated Sediment Site Restoration.
| 题名： | Quantitative Thermodynamic Exposure Assessment (QTEA) Supporting Resilient Contaminated Sediment Site Restoration. |
| 作者： | Bridges, T. S; Gidley, P. T; Lotufo, G. R; Kennedy, A. J; Ruiz, C. E; Melby, N. L; Ballentine, M. L; Wooley, A; Laber, C; Ghosh, U; Burgess, R. M; Fernandez, L. A; Wang, A; Mayer, P; Schmidt, S. |
| 摘要： | An integrated, comprehensive capability for evaluating the effect of contaminant influx on the performance of insitu remedies, the Quantitative Thermodynamic Exposure Assessment (QTEA) was developed. Using ex situ equilibriumsampling, and in situ passive samplers, in combination, resilience of in situ sediment remedies challenged byongoing sources of PCB contamination was assessed using experimental multi-species mesocosms. No remedy using ACor thin-layer capping was resilient (e.g. significant reduction >50%) to ongoing inputs of contamination.Therefore, the in situ remedies evaluated may only partially succeed under conditions of ongoing inputs atcontaminated sites. Ongoing inputs must be controlled or at least minimized. Different polymer methods (in situpassive sampling with PRCs and ex situ equilibrium sampling with multiple polymer thicknesses) provided similarresults. Overall, polymers were successful to monitor remediation as an important augmentation to bioaccumulationmeasurements. Fully successful remedy by AC was likely not achieved because of temporal factors. Sorption kineticswere slow from the sediment to the AC, especially for the most hydrophobic PCB congeners. Reductions inbioavailability by AC required a dose equal to about half the natural total organic carbon (TOC) of the sediment.The results of this work showed AC and thin-layer capping can provide value separately and in combination beyondwhat may be achievable by monitored natural recovery alone. |
| 总页数： | 158 pages |
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