Anaerobic abiotic transformations of cis-1,2-dichloroethene in fractured sandstone

Darlington, Ramona; Lehmicke, Leo G.; Andrachek, Richard G.; Freedman, David L.

doi:10.1016/j.chemosphere.2012.09.084

Cited by 17 publications

(17 citation statements)

References 18 publications

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“…The TCE-spiked samples also were monitored for organic acids (i.e., glycolate, lactate, acetate, formate), as generation of these acids have been observed by others (Darlington et al, 2013). However, no generation of organic acids was observed.…”

Section: Laboratory Datamentioning

confidence: 92%

“…Thus, this study demonstrated that abiotic dechlorination reactions occurred between TCE and ferrous rock minerals within the rock matrix. Differences in results between Schaefer et al (2013) and Darlington et al (2013) may be due to the contaminant (TCE vs. DCE), the nature of the rock tested, and/or the nature of the experiment (e.g., crushed rock vs. intact rock, attainment of anoxic conditions).…”

Section: Introductionmentioning

confidence: 95%

“…Darlington et al (2013), using crushed sedimentary rock collected from a cis-1,2-dichlorethene (DCE) impacted fractured bedrock site, demonstrated that abiotic dechlorination of DCE was occurring. However, generation of the reductive degradation products ceased after several days.…”

Section: Introductionmentioning

confidence: 99%

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Abiotic dechlorination in rock matrices impacted by long-term exposure to TCE

et al. 2015

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Section: Laboratory Datamentioning

confidence: 92%

Section: Introductionmentioning

confidence: 95%

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Abiotic dechlorination in rock matrices impacted by long-term exposure to TCE

et al. 2015

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“…Abiotic transformation of carbon tetrachloride (CT), trichloroethane (TCA), TCE, and PCE has been investigated by a number of research groups using reactive iron minerals such as pyrite, troilite, mackinawite (Butler and Hayes ; Choi et al ; Hansson et al ; Lee and Batchelor , ; Kim et al ), vivianite (Bae and Lee ), magnetite (Lee and Batchelor ), and green rusts (Ayala‐Luis et al ; Lee and Batchelor ; Liang and Butler ; O'Loughlin et al ). Additionally, several field‐related studies have provided evidence that reactive iron minerals, such as iron sulfides and magnetite, may have important contributions to the degradation of chlorinated solvents in natural and engineered systems (Butler et al ; Darlington et al , ; Davis et al ; Devlin and Muller ; Ferrey et al ; Kennedy et al ; Kenneke and Weber 2003; Shen and Wilson ). However, active engineering of reactive minerals in field conditions for the treatment of chlorinated solvents has only recently attracted attention.…”

Section: Introductionmentioning

confidence: 99%

Review of Abiotic Degradation of Chlorinated Solvents by Reactive Iron Minerals in Aquifers

He¹,

Wilson²,

Su³

et al. 2015

Groundwater Monitoring Rem

117

121

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Abiotic degradation of chlorinated solvents by reactive iron minerals such as iron sulfides, magnetite, green rust, and other Fe(II)‐containing minerals has been observed in both laboratory and field studies. These reactive iron minerals form under iron‐ and sulfate‐reducing conditions which are commonly found in permeable reactive barriers (PRBs), enhanced reductive dechlorination (ERD) treatment locations, landfills, and aquifers that are chemically reducing. The objective of this review is to synthesize current understanding of abiotic degradation of chlorinated solvents by reactive iron minerals, with special focus on how abiotic processes relate to groundwater remediation. Degradation of chlorinated solvents by reactive minerals can proceed through reductive elimination, hydrogenolysis, dehydrohalogenation, and hydrolysis reactions. Degradation products of abiotic reactions depend on degradation pathways and parent compounds. Some degradation products (e.g., acetylene) have the potential to serve as a signature product for demonstrating abiotic reactions. Laboratory and field studies show that various minerals have a range of reactivity toward chlorinated solvents. A general trend of mineral reactivity for degradation of chlorinated solvents can be approximated as follows: disordered FeS > FeS > Fe(0) > FeS2 > sorbed Fe2+ > green rust = magnetite > biotite = vermiculite. Reaction kinetics are also influenced by factors such as pH, natural organic matter (NOM), coexisting metal ions, and sulfide concentration in the system. In practice, abiotic reactions can be engineered to stimulate reactive mineral formation for groundwater remediation. Under appropriate site geochemical conditions, abiotic reactions can occur naturally, and can be incorporated into remedial strategies such as monitored natural attenuation.

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“…Abiotic degradation of chlorinated ethylenes in aquifer materials containing magnetite can be an important mechanism for natural attenuation (Lee and Batchelor 2002 ;Ferrey et al 2004 ;Darlington et al 2008Darlington et al , 2013He et al 2009He et al , 2015. In contrast to anaerobic biodegradation, abiotic degradation by magnetite does not go through a sequential reductive dechlorination (Lee and Batchelor 2002 ;Darlington et al 2013 ). That is, tetrachloroethylene (PCE) is not degraded to produce trichloroethylene (TCE), TCE is not degraded to cis -1,2-dichloroethylene ( cis -DCE), and cis -DCE is not degraded to produce vinyl chloride (VC).…”

Section: Introductionmentioning

confidence: 99%

Efficacy of an In‐Well Sonde to Determine Magnetic Susceptibility of Aquifer Sediment

Wiedemeier¹,

Wilson²,

Ferrey³

et al. 2017

Groundwater Monitoring Rem

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Magnetite is a natural component of many aquifers. Abiotic degradation of chlorinated solvents by magnetite can be an important mechanism for natural attenuation of these contaminants. The quantity of magnetite in aquifer materials can be estimated by measuring the magnetic susceptibility of the materials. This is most commonly done by determining the magnetic susceptibility of core samples in an analytical laboratory using a magnetic susceptibility meter. Unfortunately, the cost of acquiring core samples often makes an evaluation of abiotic degradation by magnetite economically unrealistic. Downhole sondes (probes) are available for the determination of magnetic susceptibility. In this study, a downhole sonde was evaluated as an affordable alternative to acquiring and analyzing core samples. The sonde was introduced into 10 monitoring wells. The data from the sonde were then compared to data from core samples that were collected from the same elevation as the sonde data. The core samples analyzed in the laboratory were used as the standard against which the sonde data were compared. The downhole sonde reported values that were similar to values reported on core samples. At most wells, the means of the two measurements could not be distinguished at the 95% confidence interval. When the means could be distinguished, they still agreed within a factor of two.

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Anaerobic abiotic transformations of cis-1,2-dichloroethene in fractured sandstone

Cited by 17 publications

References 18 publications

Abiotic dechlorination in rock matrices impacted by long-term exposure to TCE

Abiotic dechlorination in rock matrices impacted by long-term exposure to TCE

Review of Abiotic Degradation of Chlorinated Solvents by Reactive Iron Minerals in Aquifers

Efficacy of an In‐Well Sonde to Determine Magnetic Susceptibility of Aquifer Sediment

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