Unravelling long-term source removal effects and chlorinated methanes natural attenuation processes by C and Cl stable isotopic patterns at a complex field site

The Science of the Total Environment
Diana Rodríguez-FernándezMònica Rosell

Abstract

The effects of contaminant sources removal in 2005 (i.e. barrels, tank, pit and wastewater pipe sources) on carbon tetrachloride (CT) and chloroform (CF) concentration in groundwater were assessed at several areas of a fractured multi-contaminant aquifer (Òdena, Spain) over a long-term period (2010-2014). Changes in redox conditions, in these chlorinated methanes (CMs) concentration and in their carbon isotopic compositions (δ13C) were monitored in multilevel wells. δ13C values from these wells were compared to those obtained from sources (barrels, tank and pit before their removal, 2002-2005) and to commercial solvents values in literature. Additionally, CMs natural attenuation processes were identified by C-Cl isotope slopes (Λ). Analyses revealed the downstream migration of the pollutant focus and an efficient removal of DNAPLs in the pit source's influence area. However, the removal of the contaminated soil from former tank and wastewater pipe was incomplete as leaching from unsaturated zone was proved, evidencing these areas are still active sources. Nevertheless, significant CMs degradation was detected close to all sources and Λ values pointed to different reactions. For CT in the tank area, Λ value fitted with hydrogeno...Continue Reading

Citations

Jan 30, 2020·Environmental Science. Processes & Impacts·Ann Sullivan OjedaBarbara Sherwood Lollar
Jan 12, 2021·Water Environment Research : a Research Publication of the Water Environment Federation·Amir Mohaghegh MotlaghHumayra Saba
May 9, 2021·Environmental Science and Pollution Research International·Jin-Ru Feng, Hong-Gang Ni

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