PMID- 15035590
OWN - NLM
STAT- MEDLINE
DCOM- 20040601
LR  - 20191108
IS  - 0017-467X (Print)
IS  - 0017-467X (Linking)
VI  - 42
IP  - 2
DP  - 2004 Mar-Apr
TI  - Effect of iron type on kinetics and carbon isotopic enrichment of chlorinated 
      ethylenes during abiotic reduction on Fe(0).
PG  - 268-76
AB  - Four samples of two commercially available iron brands used as substrate for iron 
      permeable reactive barriers (PRBs) were tested for suitability for remediation of 
      perchloroethylene (PCE), trichloroethylene (TCE), cis-dichloroethylene (cDCE) and 
      vinyl chloride (VC). Kinetic studies indicate that rates of reaction are enhanced 
      for cDCE and VC on Connelly iron (2.8 x 10(-4) to 6.9 x 10(-4) L/m2/hr and 2.0 x 
      10(-4) to 9.0 x 10(-4) L/m2/hr, for cDCE and VC, respectively) vs. Peerless iron 
      (3.1 x 10(-5) to 4.6 x 10(-5) L/m2/hr and 2.4 x 10(-5) to 4.1 x 10(-5) L/m2/hr, 
      for cDCE and VC, respectively). Carbon isotopic analyses of the residual 
      chlorinated ethylene (CE) during degradation indicate significant fractionation 
      occurs during reductive dechlorination, with, for example, up to 70% enrichment 
      in carbon isotopic values observed when VC is more than 99% degraded. Comparison 
      of fractionation factors (epsilon) indicates significant differences in carbon 
      isotopic fractionation for different iron types and for different CEs. For the 
      lower CEs (cDCE and VC) in particular, both slower reaction rates and larger 
      fractionation are observed for degradation on Peerless vs. Connelly iron. This is 
      the first study to establish a correlation between the rate of abiotic 
      degradation on Fe(0) and the extent of isotopic fractionation, and the first to 
      confirm consistent differences in these two parameters as a function of iron 
      type. The possibility that these differences in kinetics and carbon isotopic 
      fractionation for cDCE and VC are related to differences in branching ratios 
      between competing hydrogenolysis and beta-elimination reactions during reductive 
      dechlorination on the iron surfaces is discussed.
FAU - VanStone, Nancy A
AU  - VanStone NA
AD  - Department of Chemistry, University of Toronto, 80 St. George St., Toronto, 
      Ontario, Canada M5S 3H6.
FAU - Focht, Robert M
AU  - Focht RM
FAU - Mabury, Scott A
AU  - Mabury SA
FAU - Lollar, Barbara Sherwood
AU  - Lollar BS
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - Ground Water
JT  - Ground water
JID - 9882886
RN  - 0 (Environmental Pollutants)
RN  - 0 (Ethylenes)
RN  - 0 (Membranes, Artificial)
RN  - 0 (Water Pollutants)
RN  - E1UOL152H7 (Iron)
SB  - IM
MH  - Environmental Pollutants/*isolation & purification
MH  - Ethylenes/*chemistry
MH  - Iron/*chemistry
MH  - Kinetics
MH  - Membranes, Artificial
MH  - *Models, Theoretical
MH  - Oxidation-Reduction
MH  - Permeability
MH  - Water Pollutants/*isolation & purification
EDAT- 2004/03/24 05:00
MHDA- 2004/06/02 05:00
CRDT- 2004/03/24 05:00
PHST- 2004/03/24 05:00 [pubmed]
PHST- 2004/06/02 05:00 [medline]
PHST- 2004/03/24 05:00 [entrez]
AID - 10.1111/j.1745-6584.2004.tb02673.x [doi]
PST - ppublish
SO  - Ground Water. 2004 Mar-Apr;42(2):268-76. doi: 10.1111/j.1745-6584.2004.tb02673.x.