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Chlorinated Organics in Simulated Groundwater Environments

Frances Parsons and Gladys B. Lage
Journal (American Water Works Association)
Vol. 77, No. 5, Groundwater (MAY 1985), pp. 52-59
Stable URL: http://www.jstor.org/stable/41272417
Page Count: 8
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Chlorinated Organics in Simulated Groundwater Environments
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Abstract

Tetrachloromethane and 1,1,1-trichloroethane were transformed in microcosms composed of aquifer materials to trichloromethane and 1,1-dichloroethane, respectively. Further observations of tri-and tetrachloroethene in microcosms demonstrated the transformation of these compounds to dichloroethene. Biotransformation products of these four solvents by freshwater sediment microbiota, in sealed static microcosms, were determined by gas chromatography during incubation at ambient temperatures in the dark for periods of up to 16 weeks. Under conditions of neutral to acid pH, reductive potential, and the absence of oxygen and light, reductive dehalogenation of these four compounds occurred. Chlorinated alkenes were consistently more resistant to biotransformation than the chlorinated alkanes. Tetraclorometanoy 1,1,1-tricloroetano fueron transformados en microcosmos compuestos de material acuífero a triclorometano y 1,1-dicloroetano respectivamente. Observaciones adicionales de tri- y tetracloroetano en microcosmos demostraron la transformación de estos compuestos a dicloroeteno. Los productos de la biotransformación de estos cuatro solventes con microbios de sedimentos de agua dulce, en microcosmos estáticos sellados, fueron determinados por medio de cromatografía de gas durante una incubación a temperatura ambiente en la obscuridad por periodos de hasta 16 semanas. Bajo condiciones de pH neutral a pH ácido, potencial reductivo, y en la ausencia de oxígeno y luz, estos cuatro compuestos sufrieron una dehalogenación reductiva. Los alquenos clorinados fueron consistentemente más resistentes a la biotransformación que los alcanos clorinados.

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