EPA Method TO-9

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EPA Method TO-9:
Determination Of Polychlorinated, Polybrominated And Brominated/Chlorinated Dibenzo-p-Dioxins And Dibenzofurans In Ambient Air

Quartz-fiber filters and glass adsorbent cartridges are pre-cleaned with appropriate solvents and dried in a clean atmosphere. The PUF adsorbent plugs are subjected to 4-hour Soxhlet extraction using an oversized extractor to prevent distortion of the PUF plug. The PUF plugs are then air dried in a clean atmosphere and installed in the glass cartridges. A 50 microliter (FL) aliquot of a 16 picogram/microliter (pg/FL) solution of 37Cl -2,3,7,8-TCDD is spiked to the PUF in the laboratory prior to field deployment. (Different amounts and 4 additional 13C -labeled standards such as 13C -1,2,3,6,7,8-HxCDF may also be used if desired.) The cartridges 12 12 are then wrapped in aluminum foil to protect from light, capped with Teflon? end caps, placed in a cleaned labeled shipping container, and tightly sealed with Teflon? tap until needed.

This document describes a sampling and analysis method for the quantitative determination of polyhalogenated dibenzo-p-dioxins and dibenzofurans (PHDDs/PHDFs) in ambient air, which include the polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDDs/PCDFs), polybrominated dibenzo-p-dioxins and dibenzofurans (PBDDs/PBDFs), and bromo/chloro dibenzo-p-dioxins and dibenzofurans (BCDDs/BCDFs). The method uses a high volume air sampler equipped with a quartz-fiber filter and polyurethane foam (PUF) adsorbent for sampling 325 to 400 m3 ambient air in a 24-hour sampling period. Analytical procedures based on high resolution gas chromatography-high resolution mass spectrometry (HRGC-HRMS) are used for analysis of the sample.

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