Environmental impact of ongoing sources of metal contamination on remediated sediments

A challenge to all remedial approaches for contaminated sediments is the continued influx of contaminants from uncontrolled sources following remediation. We investigated the effects of ongoing contamination in mesocosms employing sediments remediated by different types of active and passive caps an...

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Bibliographic Details
Published in:The Science of the total environment 2016-09, Vol.563-564 (C), p.108-117
Main Authors: Knox, Anna Sophia, Paller, Michael H., Milliken, Charles E., Redder, Todd M., Wolfe, John R., Seaman, John
Format: Article
Language:English
Subjects:
Active caps
Animals
Arsenic - metabolism
Bioavailability
Biological Availability
Environmental Monitoring
Environmental Restoration and Remediation - methods
ENVIRONMENTAL SCIENCES
Geologic Sediments - analysis
Lumbriculus
Lumbriculus variegatus
Metals
Metals, Heavy - metabolism
Oligochaeta - metabolism
Passive caps
Re-contamination
Remediated sediment
Selenium - metabolism
Water Pollutants, Chemical - metabolism
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Summary:A challenge to all remedial approaches for contaminated sediments is the continued influx of contaminants from uncontrolled sources following remediation. We investigated the effects of ongoing contamination in mesocosms employing sediments remediated by different types of active and passive caps and in-situ treatment. Our hypothesis was that the sequestering agents used in active caps and in situ treatment will bind elements (arsenic, chromium, cadmium, cobalt, copper, nickel, lead, selenium, and zinc) from ongoing sources thereby reducing their bioavailability and protecting underlying remediated sediments from recontamination. Most element concentrations in surface water remained significantly lower in mesocosms with apatite and mixed amendment caps than in mesocosms with passive caps (sand), uncapped sediment, and spike solution throughout the 2520h experiment. Element concentrations were significantly higher in Lumbriculus variegatus from untreated sediment than in Lumbriculus from most active caps. Pearson correlations between element concentrations in Lumbriculus and metal concentrations in the top 2.5cm of sediment or cap measured by diffusive gradient in thin films (DGT) sediment probes were generally strong (as high as 0.98) and significant (p
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2016.04.050