ISO 3771:2011

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Petroleum products — Determination of base number — Perchloric acid potentiometric titration method

ISO 3771:2011 refers to an international standard that outlines a method for determining the "base number" (also known as total base number or TBN) of petroleum products using a potentiometric titration technique with perchloric acid in glacial acetic acid as the titrant; essentially, it measures the basic components present in a petroleum sample like organic and inorganic bases, amino compounds, and certain salts.