ASTM D7691 Standard Test Method for Multielement Analysis of Crude Oils Using Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES)

ASTM D7691 is a standard that outlines the test method for determining the concentrations of multiple elements in crude oils using Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES). This method involves diluting the crude oil sample with an organic solvent and using metallo-organic standards for calibration. The elements of interest include iron (Fe), nickel (Ni), sulfur (S), and vanadium (V), among others.

The parameters measured in ASTM D7691—iron, nickel, sulfur, and vanadium—are crucial for several reasons. Nickel and vanadium, often present in significant amounts in crude oils, can deactivate catalysts during refining processes, leading to inefficiencies and increased costs. Sulfur compounds can contribute to atmospheric pollution when combusted, while iron can affect the quality and value of crude oils. Accurate measurement of these elements is essential for assessing the quality and usability of crude oils.

The importance of ASTM D7691 lies in its ability to provide precise and reliable measurements of these elements, which are critical for the petroleum industry. By using ICP-AES, the standard ensures high sensitivity and accuracy in detecting trace levels of iron, nickel, sulfur, and vanadium. This method helps in maintaining the efficiency of refining processes, protecting equipment from corrosion and damage, and ensuring the overall quality of crude oils. Consequently, ASTM D7691 plays a vital role in the economic and operational aspects of the petroleum industry.

With the highly robust and sensitive PlasmaQuant 9200 series, Analytik Jena offers a powerful, reliable and compliant solution for ICP-OES analyses to fulfill the requirements of ASTM D7691.

Sources

• ASTM D7691 - Standard Test Method for Multielement Analysis of Crude Oils Using Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES)