Long Term Stability of 1,4-Dioxane in Water Samples with GC/MS-SIM SPME Analysis
Changing the Paradigm for Water Pollution Monitoring
Oral Presentation
Prepared by T. Tambling
The Dow Chemical Company, 1602 building, Midland, MI, 48667, United States
Contact Information: [email protected]; 989-638-9387
ABSTRACT
Concern over 1,4-dioxane contamination in groundwater and sediment has been increasing. Current regulatory methods for the analysis of 1,4-dioxane from groundwater, such as EPA Method 8260, 8270, and 522 suggest samples be analyzed within 7 to 28 days, depending on preparatory method. This restriction on hold time is often a limiting factor when attempting to perform high-resolution plume mapping, especially when samples must be transported internationally. If samples are taken where microbial populations capable of degrading 1,4-dioxane are not present, then this hold time may not reflect the recalcitrant nature of 1,4-dioxane.
Real world unpreserved ground water samples were composited and filtered to create a series of three long-term stability samples with concentrations of approximately 0.5, 25, and 10,000 ppb in 2011. Samples were stored in a refrigerated environment and in ambient temperature storage areas without statistical change in concentrations over the span of years. Samples were analyzed using a Gas Chromatography/Mass Spectrometry – Selected Ion Monitoring Headspace – Solid Phase Microextraction (GC/MS-SIM-SPME) isotope dilution method with low cost, high automation, and with detection limits sub ppb.
Changing the Paradigm for Water Pollution Monitoring
Oral Presentation
Prepared by T. Tambling
The Dow Chemical Company, 1602 building, Midland, MI, 48667, United States
Contact Information: [email protected]; 989-638-9387
ABSTRACT
Concern over 1,4-dioxane contamination in groundwater and sediment has been increasing. Current regulatory methods for the analysis of 1,4-dioxane from groundwater, such as EPA Method 8260, 8270, and 522 suggest samples be analyzed within 7 to 28 days, depending on preparatory method. This restriction on hold time is often a limiting factor when attempting to perform high-resolution plume mapping, especially when samples must be transported internationally. If samples are taken where microbial populations capable of degrading 1,4-dioxane are not present, then this hold time may not reflect the recalcitrant nature of 1,4-dioxane.
Real world unpreserved ground water samples were composited and filtered to create a series of three long-term stability samples with concentrations of approximately 0.5, 25, and 10,000 ppb in 2011. Samples were stored in a refrigerated environment and in ambient temperature storage areas without statistical change in concentrations over the span of years. Samples were analyzed using a Gas Chromatography/Mass Spectrometry – Selected Ion Monitoring Headspace – Solid Phase Microextraction (GC/MS-SIM-SPME) isotope dilution method with low cost, high automation, and with detection limits sub ppb.
