Extending the Applicability of Compound-Specific Isotope Analysis to Low Concentrations of 1,4 Dioxane
Technical Report,01 Dec 2014,01 Jan 2018
Haley and Aldrich, Inc. Oakland United States
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The objective of this work was to develop a reliable method to perform compound-specific isotope analysis CSIA on low aqueous concentrations 1 gL of 1,4-dioxane in groundwater and then apply it to investigate 1,4-dioxane biodegradation. It was determined that 0.5 grams of a synthetic carbonaceous sorbent, when added to a 40 mL vial containing aqueous 1,4-dioxane in the 10 to 100 gL range, could adsorb more than 99 percent of the 1,4-dioxanefrom solution. The 1,4-dioxane was successfully recovered from the dried solid sorbent by thermal desorption into a gas chromatograph with isotope ratio mass spectrometry. The method was successfully applied to samples at concentrations in the 1 gL range. It is anticipated that the CSIA method will be applied to demonstrate the biodegradation of 1,4-dioxane in the1-100 gL range. The method is likely to be adaptable to other contaminants and media e.g., air and soil, thereby extending the applicability of CSIA to possibly document degradation processes that may be occurring at much lower concentrations in the environment.
- Organic Chemistry