Origin and Propagation of an Incorrect Chemical Degradation Pathway in the Literature: cis-1,2-Dichloroethylene as a Daughter Product of 1,1,1-Trichloroethane

TRRP Training: 2022 Program

presented by: GSI Environmetal Inc.

Texas Risk Reduction Program regulations (TRRP; 30 TAC 350) establish consistent risk-based protocols for assessment and response to soil, groundwater, or surface water impacts associated with environmental releases of regulated wastes or substances.

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June 14th and 15th, 2022

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Authors: Michal Rysz, Miriam K. Connor, Roopa Kamath, Charles J. Newell

Published: March 2010 in Environmental Forensics pages 50-59.

Abstract
The correct understanding of contaminant degradation pathways is essential for well-informed decision processes regarding site assessment, monitored natural attenuation, and environmental liability proceedings. Over a 20-year period, and including at least one recent regulatory publication, it has been erroneously reported that cis-1,2-dichloroethylene (cis-DCE) is the daughter product of 1,1,1-trichloroethane (1,1,1-TCA). To clarify the degradation pathways of 1,1,1-TCA, and to corroborate that cis-DCE is not a degradation product of 1,1,1-TCA as suggested and propagated by some sources, we conducted a detailed review of the available literature and mapped out a citation history of 27 publications and reports which contain both the correct and incorrect degradation pathways. Other than the sources containing the erroneous degradation pathways, the reviewed literature shows that cis-DCE is not a proven transformation product of 1,1,1-TCA.