1. Álcool etílico–Determinação da acidez total. ABNT NBR 9866; 2006.
2. Ethanol as a blending component for petrol–Determination of total acidity–Colour indicator titration method. EN 15491; 2007.
3. Standard test method for acidity in volatile solvents and chemical intermediates used in paint, varnish, lacquer, and related products. ASTM D1613; 2006.
4. Resolução 36. ANP; 2005.