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The Combination of 3 New Sampling Techniques Paired with GCMS for Determination of Uptake Rates and Accurate Monitoring of SVOC Endocrine Disruptors in Indoor Air
A novel approach for the quantitative passive sampling of semi-volatile organic compounds (SVOCs) in ambient and indoor air down to low part per trillion levels is presented. The new approach solves issues which have prevented quantitative passive monitoring in the past, including:
- Obtaining accurate uptake rates for all target compounds.
- Performing quantitative spiking of diffusive monitors or tubes to achieve equivalent recoveries compared to passive field sampling.
- Creating effective procedures for GCMS calibration and method validation.
Simple diffusive samplers are placed at the sampling location for between 1-30 days to allow passive collection of SVOCs. Uptake rates for each SVOC were determined by co-locating active samplers collecting air at 0.5cc/min. Responses were compared to determine diffusive sampling rates for the SVOCs detected and identified. Conversion of area counts to actual ng on tube is performed by diffusively loading standards onto the tubes followed by splitless thermal desorption into the GCMS to create calibration curves.
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