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ASTM D664: Total Acid Number Testing by ScribdTranslations is a document available to read on EtoBox.

ASTM D664 outlines a method for determining the total acid number in petroleum derivatives, lubricants, and biodiesel through potentiometric titration. The procedure involves titrating a sample with potassium hydroxide and measuring the acidity index, which serves as a quality control indicator but does not predict corrosivity. The document details necessary materials, equipment, electrode preparation, and quality control measures to ensure accurate results.

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