ASTM D8252-23 PDF

Overview

ASTM D8252-23: Standard Test Method for Vanadium and Nickel in Crude and Residual Oil by X-ray Spectrometry provides a rapid and precise method for determining the concentration of vanadium and nickel in crude and residual oils using X-ray fluorescence (XRF) spectrometry. Developed by ASTM International, this standard supports efficient quality control, operational decision-making, and compliance in the petroleum industry. The method offers fast analysis times-typically 4 to 5 minutes per sample, with minimal sample preparation (1 to 3 minutes)-and is designed for use with wavelength dispersive (WDXRF) or energy dispersive (EDXRF) X-ray spectrometers.

Key Topics

• Applicability:

  • Designed for quantitative determination of vanadium (1.9–50 mg/kg) and nickel (2.2–50 mg/kg) in crude and residual oils.
  • XRF spectrometers using X-ray tube excitation are required, with either wavelength or energy dispersive detection.

• Significance:

  • Monitoring vanadium and nickel is crucial, as these metals impact refinery catalyst performance and can affect contractual agreements for crude quality.
  • High levels of vanadium and nickel can lead to contamination of catalytic cracking units and degrade refining processes.

• Procedure Outline:

  • Sample preparation using X-ray transparent films and standardized cups.
  • Instrument calibration with certified reference materials or carefully prepared in-house standards.
  • Analytical correction for matrix effects, including X-ray absorption/enhancement and spectral overlaps.
  • Use of empirical regression or fundamental parameter approaches for calibration.

• Results Reporting:

  • Results are reported as total mass fraction concentrations in mg/kg.
  • Repeatability and reproducibility are well-established, supporting interlaboratory consistency.

• Safety and Compliance:

  • Users must ensure compliance with X-ray and chemical handling safety standards.
  • The method was developed in accordance with WTO principles for international standards.

Applications

ASTM D8252-23 is widely used in the following contexts:

• Refinery Operations:
  • Determines if crude or residual oil meets processing requirements for vanadium and nickel content, helping to prevent catalyst poisoning and protect equipment.
• Quality Assurance:
  • Used in contract verification and quality control laboratories to ensure the elemental composition of petroleum feedstocks aligns with buyer and regulatory specifications.
• Environmental Compliance:
  • Assists in monitoring trace metals to meet environmental regulations when oils are used as fuels.

Industrial Benefits:

• Reduces risk of equipment fouling and extended downtime due to high metal contaminants.
• Enables reliable, high-throughput screening of production batches with minimal sample handling.
• Supports contractual certainty and avoids disputes via standardized measurement practices.

Related Standards

For comprehensive elemental analysis in petroleum products, the following ASTM standards are often used in conjunction:

• ASTM D2622 - Sulfur in Petroleum Products by Wavelength Dispersive X-ray Fluorescence Spectrometry
• ASTM D4294 - Sulfur in Petroleum and Petroleum Products by Energy Dispersive X-ray Fluorescence Spectrometry
• ASTM D4057 / D4177 - Manual and Automatic Sampling of Petroleum and Petroleum Products
• ASTM D6259 - Determination of a Pooled Limit of Quantitation for a Test Method
• ASTM D6299 - Statistical Quality Assurance and Control Charting Techniques
• ASTM D7343 - XRF Spectrometry Methods for Petroleum Products and Lubricants
• ASTM E1621 - Guide for Elemental Analysis by WDXRF

Keywords: vanadium, nickel, crude oil, residual oil, X-ray spectrometry, X-ray fluorescence, XRF, EDXRF, WDXRF, ASTM D8252, petroleum quality, refinery catalyst protection, elemental analysis.