DOI: 10.1016/j.watres.2018.11.029
Scopus记录号: 2-s2.0-85058806692
论文题名: Determination of in situ biodegradation rates via a novel high resolution isotopic approach in contaminated sediments
作者: Gilevska T. ; Passeport E. ; Shayan M. ; Seger E. ; Lutz E.J. ; West K.A. ; Morgan S.A. ; Mack E.E. ; Sherwood Lollar B.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 632
结束页码: 639
语种: 英语
英文关键词: Biodegradation rates
; High resolution sampling
; REV
; Sediment
; Stable isotopes
Scopus关键词: Benzene
; Contamination
; Detoxification
; Isotopes
; Sediments
; Biodegradation potentials
; Biodegradation rate
; Contaminant concentrations
; High resolution sampling
; Passive diffusion samplers
; Representative elementary volume
; Simultaneous degradation
; Stable isotopes
; Biodegradation
; benzene
; carbon 13
; chlorobenzene
; iron
; surface water
; benzene
; biodegradation
; carbon isotope
; chlorobenzene
; concentration (composition)
; isotopic analysis
; resolution
; sampler
; sampling
; sediment pollution
; sediment-water interface
; stable isotope
; Article
; biodegradation
; contamination
; priority journal
; sediment
英文摘要: A key challenge in conceptual models for contaminated sites is identification of the multiplicity of processes controlling contaminant concentrations and distribution as well as quantification of the rates at which such processes occur. Conventional protocol for calculating biodegradation rates can lead to overestimation by attributing concentration decreases to degradation alone. This study reports a novel approach of assessing in situ biodegradation rates of monochlorobenzene (MCB) and benzene in contaminated sediments. Passive diffusion samplers allowing cm-scale vertical resolution across the sediment-water interface were coupled with measurements of concentrations and stable carbon isotope signatures to identify zones of active biodegradation of both compounds. Large isotopic enrichment trends in 13 C were observed for MCB (1.9–5.7‰), with correlated isotopic depletion in 13 C for benzene (1.0–7.0‰), consistent with expected isotope signatures for substrate and daughter product produced by in situ biodegradation. Importantly in the uppermost sediments, benzene too showed a pronounced 13 C enrichment trend of up to 2.2‰ providing definitive evidence for simultaneous degradation as well as production of benzene. The hydrogeological concept of representative elementary volume was applied to CSIA data for the first time and identified a critical zone of 10–15 cm with highest biodegradation potential in the sediments. Using both stable isotope-derived rate calculations and numerical modeling, we show that MCB degraded at a slower rate (0.1–1.4 yr −1 and 0.2–3.2 yr −1 , respectively) than benzene (3.3–84.0 yr −1 ) within the most biologically active zone of the sediment, contributing to detoxification. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122120
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth Sciences, University of Toronto, Toronto, Ontario M5S 3B1, Canada; Department of Civil and Mineral Engineering, University of Toronto, Toronto, Ontario M5S 1A4, Canada; Department of Chemical Engineering and Applied Chemistry, Toronto, Ontario M5S 3E5, Canada; The Chemours Company, Wilmington, DE 19810, United States; AECOM, Deepwater, NJ 08023, United States; Dupont, Wilmington, DE 19805, United States
Recommended Citation:
Gilevska T.,Passeport E.,Shayan M.,et al. Determination of in situ biodegradation rates via a novel high resolution isotopic approach in contaminated sediments[J]. Water Research,2019-01-01