Sediment Monitored Natural Recovery Evidenced by Compound Specific Isotope Analysis and High-Resolution Pore Water Sampling
| Autor: | Richard C. Landis, Elizabeth Erin Mack, Scott A. Morgan, Elodie Passeport, Kathryn A. West, Barbara Sherwood Lollar, Edward J Lutz, Georges Lacrampe-Couloume |
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| Rok vydání: | 2016 |
| Předmět: |
Halogenation
0208 environmental biotechnology 02 engineering and technology 010501 environmental sciences 01 natural sciences Pore water pressure Sediment–water interface Reductive dechlorination Environmental Chemistry Water pollution 0105 earth and related environmental sciences Isotope analysis Carbon Isotopes Stable isotope ratio Chemistry Sediment Benzene General Chemistry 6. Clean water 020801 environmental engineering Biodegradation Environmental 13. Climate action Isotopes of carbon Environmental chemistry Water Pollutants Chemical Environmental Monitoring |
| Zdroj: | Environmental Science & Technology. 50:12197-12204 |
| ISSN: | 1520-5851 0013-936X |
| Popis: | Monitoring natural recovery of contaminated sediments requires the use of techniques that can provide definitive evidence of in situ contaminant degradation. In this study, a passive diffusion sampler, called “peeper”, was combined with Compound Specific Isotope Analysis to determine benzene and monochlorobenzene (MCB) stable carbon isotope values at a fine vertical resolution (3 cm) across the sediment water interface at a contaminated site. Results indicated significant decrease in concentrations of MCB from the bottom to the top layers of the sediment over 25 cm, and a 3.5 ‰ enrichment in δ13C values of MCB over that distance. Benzene was always at lower concentrations than MCB, with consistently more depleted δ13C values than MCB. The redox conditions were dominated by iron reduction along most of the sediment profile. These results provide multiple lines of evidence for in situ reductive dechlorination of MCB to benzene. Stable isotope analysis of contaminants in pore water is a valuable method to de... |
| Databáze: | OpenAIRE |
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