Abstract
Stable hydrogen isotopes of two chlorinated solvents, trichloroethylene (TCE) and 1,1,1-trichloroethane (TCA), provided by five different manufacturers, were determined and compared to their carbon and chlorine isotopic signatures. The isotope ratio for δ 2H of different TCEs ranged between +466.9‰ and +681.9‰, for δ 13C between −31.57‰ and −27.37‰, and for δ 37Cl between −3.19‰ and +3.90‰. In the case of the TCAs, the isotope ratio for δ 2H ranged between −23.1‰ and +15.1‰, for δ 13C between −27.39‰ and −25.84‰, and for δ 37Cl between −3.54‰ and +1.39‰. As well, a column experiment was carried out to dechlorinate tetrachloroethylene (PCE) to TCE using iron. The dechlorination products have completely different hydrogen isotope ratios than the manufactured TCEs. Compared to the positive values of δ 2H in manufactured TCEs (between +466.9‰ and +681.9‰), the dechlorinated products had a very depleted δ 2H (less than −300‰). This finding has strong implications for distinguishing dechlorination products (PCE to TCE) from manufactured TCE. In addition, the results of this study show the potential of combining 2H/ 1H analyses with 13C/ 12C and 37Cl/ 35Cl for isotopic fingerprinting applications in organic contaminant hydrogeology.
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