Innovative Environmental Technologies, Inc. (IET)

Technical Bulletin: c-DCE stall out

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Courtesy of Courtesy of Innovative Environmental Technologies, Inc. (IET)

Trichloroethene (TCE) and Perchloroethene (PCE) chlorinated solvents have been responsible for the serious contamination of soils and groundwater. The occurrence of cis-DCE “stall”, the condition of where it appears biodegradation beyond cis-DCE to vinyl chloride does not occur resulting in cis-DCE accumulation, is often misinterpreted.

How do you know if your site has c-DCE “Stall”?
1) Evaluate the sorption relationships of the daughter products and PCE/TCE.
2) Determine if sulfate/sulfite are competing as terminal electron acceptors with c-DCE.
3) Evaluate the ORP and the pH of up-gradient, down-gradient and cross-gradient wells.
4) Correlate iron species with sulfate/sulfite data in unfiltered, bicarbonate extractions.

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