SciMed Applications
Sulphur Analysis by WD-XRF
(ASTM D2622)
ASTM D2622: Standard Method for Sulphur Analysis Using WD-XRF
ASTM D2622 is a widely recognised standard test method for determining sulphur content in petroleum products using wavelength dispersive X-ray fluorescence spectrometry (WD-XRF). It provides accurate and repeatable results, making it suitable for regulatory compliance and routine fuel testing.
At SciMed, we offer a selection of WD-XRF solutions from Rigaku that fully comply with ASTM D2622. For example, the Micro Z-ULS, Supermini 200, and ZSX Primus systems all demonstrate excellent performance in sulphur analysis. A detailed application note is available on request, showcasing how these instruments achieve reliable results in line with ASTM D2622-16.
The method specifically applies to WD-XRF instrumentation and does not include ED-XRF systems. As a result, it is typically used for specialised applications where the highest levels of precision are required. In contrast, alternative methods such as ASTM D4294 offer more flexibility in instrument choice, although they may differ in accuracy and scope.
ASTM D2622: Standard Test Method for Sulphur in Petroleum Products
ASTM D2622 is designed for the measurement of total sulphur in petroleum and petroleum products that meet specific conditions.
In practice, the method applies to samples that are:
Single-phase
Liquid at ambient conditions
Liquefiable with moderate heat
Or soluble in hydrocarbon solvents
As a result, this method covers a wide variety of fuels and oils. For example, it can be used for:
Diesel fuel
Jet fuel
Kerosene
Other distillate oils
Biodiesel
Residual oil
Lubricating base oil
Hydraulic oil
Crude oil
Unleaded gasoline
Gasoline-ethanol blends
Naphtha
In summary, ASTM D2622 is highly versatile and supports reliable sulphur testing across both refined products and crude petroleum samples.
Alternative XRF Methods to ASTM D2622 for Sulphur Testing
ASTM D2622 is not the only standard for sulphur analysis using X-ray fluorescence. In fact, several other XRF-based methods are available, particularly those that use energy dispersive XRF (ED-XRF) technology. As a result, laboratories can select the most appropriate method depending on their sample type, accuracy requirements, and regulatory framework.
Common alternatives include:
ASTM D4294 – Standard Test Method for Sulphur in Petroleum and Petroleum Products by Energy Dispersive X-ray Fluorescence Spectrometry.
ISO 13032 – Petroleum products — Determination of low concentrations of sulphur in automotive fuels using ED-XRF.
ISO 20847:2004 – Petroleum products — Determination of sulphur content of automotive fuels by ED-XRF.
IP 496 – Petroleum products — Determination of the sulphur content of automotive fuels using ED-XRF.
IP 336 – Petroleum products — Determination of sulphur content using ED-XRF.
ASTM D7220 – Standard Test Method for Sulphur in Automotive, Heating, and Jet Fuels by Monochromatic Energy Dispersive X-ray Fluorescence Spectrometry.
In summary, while ASTM D2622 specifies WD-XRF, these alternative ED-XRF methods provide flexibility in instrumentation and can be more cost-effective for certain applications.
Non-XRF Alternatives to ASTM D2622 for Sulphur Testing
WD-XRF and ED-XRF are not the only approved methods for determining sulphur in petroleum products. In fact, one of the most common alternatives is based on ultraviolet fluorescence (UVF), which relies on a combustion process.
The key standard for this technique is:
ASTM D5453 – Standard Test Method for Determination of Total Sulphur in Light Hydrocarbons, Spark Ignition Engine Fuel, Diesel Engine Fuel, and Engine Oil by Ultraviolet Fluorescence.
As a result, UVF is widely used where regulatory frameworks allow it, offering a reliable alternative to XRF-based methods.
At SciMed, we provide a complete range of solutions for sulphur determination in petroleum products, including both XRF and UVF-based instruments. This means laboratories can choose the technology that best matches their compliance requirements and analytical needs.
What to Do Next?
Accurate sulphur analysis is essential for compliance with fuel regulations and maintaining product quality. If you’d like to explore application notes, learn more about ASTM D2622 methods, or speak directly with a product specialist, our team is here to help.
Contact us today for expert advice on WD-XRF systems, sulphur testing solutions, and laboratory best practices.
Page FAQ's
ASTM D2622 is a standard test method that uses wavelength dispersive X-ray fluorescence (WD-XRF) to determine sulphur content in petroleum products. It is widely accepted for regulatory compliance in fuel testing.
High sulphur levels in fuels contribute to air pollution and equipment corrosion. Accurate sulphur analysis ensures compliance with environmental regulations and improves fuel performance.
WD-XRF works by directing X-rays at a sample, causing sulphur atoms to emit characteristic secondary X-rays. The instrument measures the intensity of this emission to determine sulphur concentration with high accuracy.
WD-XRF provides precise, repeatable measurements with minimal sample preparation. It is fast, non-destructive, and capable of detecting sulphur at low concentration levels, making it ideal for routine fuel analysis.
Sulphur analysis is critical in industries such as oil refining, petrochemicals, energy, and environmental testing. These sectors rely on ASTM D2622 methods to ensure regulatory compliance and product consistency.
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