The determination of Polychlorinated Dibenzo-p-dioxins and Polychlorinated Dibenzofurans from Stationary Sources.

This method is applicable for the determination of polychlorinated dibenzo-p-dioxins (PCDD's) and polychlorinated dibenzofurans (PCDF's) from stationary sources.

Gaseous and particulate PCDDs/PCDFs are isokinetically withdrawn from an emission source and collected in a multicomponent sampling train.

The collection components consist of the front half glassware surfaces (nozzle, probe, and front half filter holder), the glass fiber filter, the back half glassware surfaces (back half filter holder and condenser coil) and the solid sorbent (XAD-2®) module.

Method 23 which allows for the combination of the front-half and back-half fractions.

The method requires the toluene rinse fraction to be prepared and analyzed separately from the other train components (XAD, filter, rinses). There is an additional fee associated with having the toluene rinse analyzed separately. However, the vast majority of projects combine the TR with the other train components. Please consult your regulatory agency if you have questions regarding how the rinse fraction should be processed.

EPA Method 23 is not equivalent to SW-846 Method 0023A, where the front-half fractions are prepared and analyzed separately from the back-half fractions.