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Application Note 114
Application note
Categories: Ambient air Thermal desorption Passive sampling Application note

Passive monitoring of benzene and other hazardous air pollutants at refinery perimeters in accordance with US EPA Method 325

Application Note 114

US EPA Method 325 has been developed to enable refineries to comply with the updated US federal regulation CFR 40, and requires monitoring of VOCs around the boundary of refineries. This involves two-week passive (diffusive) sampling onto sorbent tubes, followed by analysis by thermal desorption (TD) in conjunction with gas chromatography (GC), with analysis by mass spectrometry (MS) or other detection technique.

This application note describes a stepwise approach to complying with US EPA Method 325 for monitoring volatile organic compounds at refinery perimeters.

A range of equipment from Markes International is outlined that allows fully method-compliant deployment of tube-based passive samplers, sample analysis and tube cleaning.

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