1. ASTM D6560–17 – Standard Test Method for Determination of Asphaltenes (Heptane Insolubles) In Crude Oil Petroleum and Petroleum Products.
2. ASTM D664–18 - Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration.
3. ASTM D4377–20 - Standard Test Method for Water in Crude Oils by Potentiometric Karl Fischer Titration.
4. Adermann N, Boggiano J, Composer, version 1.5.3; Sierra Analytics, Pasadena, CA, USA, 2016.
5. Barros EV, Dias HP, Pinto FE, Gomes AO, Moura RR, Sad CMS, Freitas JCC, Neto Cunha A, Aquije GMFV, Romão W (2017) Study of degradation of acid crude oil by high resolution analytical techniques. J Petrol Sci Eng 154:194–203. https://doi.org/10.1016/j.petrol.2017.04.032