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4. American Standard Test Method (ASTM) D7111-15a. 2015. Standard Test Method for Determination of Trace Elements in Middle Distillate Fuels by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES), www.astm.org [Consulted: 07/10/20].
5. American Standard Test Method (ASTM) D7691-16. 2016. Standard Test Method for Multielement Analysis of Crude Oils Using Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES), www.astm.org [Consulted: 07/10/20].