Trace lead analysis method
AssigneeMobil Oil Corporation
InventorsCatherine A. Zelaskowski, John J. Carlisi
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Abstract
The trace lead content of gasoline, specifically in lead concentrations of about 0.01 to 0.10 grams of lead per U.S. gallon of gasoline, is determined colorimetrically by the steps of mixing an iodine solution with the gasoline, subjecting the mixture to ultra-violet light and adding an indicator solution containing 4-(2-pyridylazo)-resorcinol disodium salt with agitation and comparing the resulting color to standard indicator solutions.
Claims8
A method for colorimetrically determining the lead content in gasoline by converting the tetraalkyllead in a gasoline to a dialkyllead diiodide comprising reacting the tetraalkyllead with iodine and exposing the resulting reaction mixture to ultraviolet radiation of 2800A to below 4000A whereby said dialkyllead diiodide is formed, adding a pyridylazo hydroxyaryl compound in aqueous solution to the gasoline to produce a color in the aqueous phase corresponding to the initial lead concentration.
Dependencies are inferred from the claim text.