ASTM D5863 Nickel, Vanadium, Iron, and Sodium in Crude Oils and Residual Fuels
ASTM D5863 Standard Test Methods for Determination of Nickel, Vanadium, Iron, and Sodium in Crude Oils and Residual Fuels by Flame Atomic Absorption Spectrometry
5. Purity of Reagents
5.1 Reagent grade chemicals shall be used for all tests. Unless otherwise indicated, it is intended that all reagents conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society where such specifications are available. Other grades may be used, provided it is first ascertained that the reagent is of sufficiently high purity to permit its use without lessening the accuracy of the determination.
5.2 When determining metals at concentrations less than 1 mg/kg, use ultra-pure grade reagents.
5.3 Purity of Water - Unless otherwise indicated, reference to water shall be understood to mean reagent water conforming to Type II of Specification D1193.
6. Sampling and Sample Handling
6.1 The objective of sampling is to obtain a sample for testing purposes that is representative of the entire quantity. Only representative samples obtained as specified in Practices D4057 and D4177 shall be used. Do not fill the sample container more than two-thirds full
6.2 Prior to weighing, stir the sample and then shake the sample in its container. If the sample does not readily flow at room temperature, heat the sample to a sufficiently high and safe temperature to ensure adequate fluidity.
