Residual fuels. Crude oil (HS 150810), Crude oil (HS 151110), Crude oil (HS 151211), Crude oil (HS 151311), Crude oil (HS 151321), Crude oil (HS 151411), Crude oil (HS 151491), Crude oil (HS 151521). Crude petroleum (ICS 75.040).

DUS 1871:2017, Standard Test Method for Determination of Nickel, Vanadium, Iron, and Sodium in Crude Oils and Residual Fuels by Flame Atomic Absorption Spectrometry. (15 page(s), in English)

This draft test methods cover the determination of nickel, vanadium, iron, and sodium in crude oils and residual fuels by flame atomic absorption spectrometry (AAS). Two different test methods are presented. Test Method A, Flame AAS is used to analyze a sample that is decomposed with acid for the determination of total Ni, V, and Fe. Test Method B, Flame AAS is used to analyze a sample diluted with an organic solvent for the determination of Ni, V, and Na. This test method uses oil-soluble metals for calibration to determine dissolved metals and does not purport to quantitatively determine nor detect insoluble particulates. Hence, this test method may underestimate the metal content, especially sodium, present as inorganic sodium salts.