EPA Method 9079

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EPA Method 9079:
SCREENING TEST METHOD FOR POLYCHLORINATED BIPHENYLS IN TRANSFORMER OIL

Summary:
A sample of the oil to be tested is reacted with a mixture of metallic sodium catalyzed with naphthalene and diglyme at ambient temperature. This process converts all organic halogens to their respective sodium halides. All halides in the treated mixture, including those present prior to the reaction, are then extracted into an aqueous buffer, a premeasured amount of mercuric nitrate is added, followed by a solution of diphenylcarbazone as the indicator.

Scope:
Method 9079 may be used to screen hydrocarbon based electrical insulating fluids for polychlorinated biphenyls (PCBs) at preset levels of 20, 50, 100, or 500 ?g/g. The method is designed to provide screening data outside of a laboratory environment in under 10 minutes, providing a colorimetric indication that the concentration of PCBs is above or below the fixed end point. Screening procedures may significantly reduce the number of samples requiring laboratory testing.

Report Number:
SW-846 Ch 4.5