EPA Method 9077

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EPA Method 9077:
TEST METHODS FOR TOTAL CHLORINE IN NEW AND USED PETROLEUM PRODUCTS (FIELD TEST KIT METHODS)

Summary:
The oil sample (around 0.4 g by volume) is dispersed in a solvent and 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, which is then titrated with mercuric nitrate using diphenyl carbazone as the indicator. The end point of the titration is the formation of the blue-violet mercury diphenylcarbazone complex. Bromide and iodide are titrated and reported as chloride.

Scope:
The method may be used to determine if a new or used petroleum product meets or exceeds requirements for total halogen measured as chloride. An analysis of the chlorine content of petroleum products is often required prior to their use as a fuel. The method is specifically designed for used oils permitting onsite testing at remote locations by nontechnical personnel to avoid the delays for laboratory testing.

Report Number:
SW-846 Ch 5