Abstract
Abstract The occurrence of carbon isotope fractionation during dechlorination of hexachlorobenzene (HCB) to pentachlorobenzene (penta-CB) has been evaluated under ultraviolet irradiation in a photo-reactor. Stable carbon isotope ratios (δ13C) of HCB and penta-CB increased from −27.3% to 18.8% and from −33.9% to −19.5%, respectively. The isotopic fractionation of the reactants and products are described with the Rayleigh model, and the following enrichment factors (ε) are obtained: −14.8% for the dechlorination of HCB and 22.7% for the dechlorination product (penta-CB). With the initial δ13C value of HCB, this enrichment factor can be used to estimate the fraction (f) of HCB remaining by Rayleigh equation. Strong enrichment of δ13C in HCB and penta-CB during photochemical dechlorination might serve as a powerful tool to monitor the photolysis process, such information may provide additional evidence to aid in further understanding the biogeochemical processes of these compounds undergoing in the enivornment.
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