Ultra Low Sulfur Analysis

In the mid-2000's, the Environmental Protection Agency (EPA) began a program to greatly reduce the amount of sulfur (S, 16) in petroleum and petroleum products.  The low sulfur regulations were developed in an effort to improve the efficiency and effectiveness of catalytic converters; therebye reducing vehicle emissions of pollutants (including sulfur dioxide) and fine particulates.  Over time, the allowable level of sulfur in diesel fuels and petroleum products has gradually decreased.  The current ultra-low-sulfur (ULS) allowable limit of 15 ppm (parts per million) is greatly reduced from the previous limit of 500 ppm in "low-sulfur" diesel - X-ray Fluorescence Analyzers from Eastern Applied can identify these lower levels.

Ultra Low Sulfur Test EquipmentASTM International has developed a number of testing methods for determination of sulfur content that focus on a variety of analyzer technologies but ASTM Method D4294 is the one that focuses on the use of energy dispersive x-ray fluorescence (EDXRF); which offers a relatively low cost analysis method that achieves fast results with limited sample preparation.  The applicable sulfur concentration range of the ASTM Method is 17 ppm to 4.6 mass%.

Eastern Applied Research offers the XSupreme8000 and LabX3500 to meet the requirements.
     Best XRF for Sulfur Analysis:  X-Supreme8000 by Oxford Instruments

XSupreme8000 Sulfur Analysis SpectrometerOne Reason Why: The X-Supreme8000 by Oxford Instruments allows the measurement of sulfur at “Ultra Low levels” (<10ppm) with the introduction of an application focused solution.  This is a unique hardware configuration of a Ti target X-ray tube and high resolution SDD (Silicon Drift Detector), with both components manufactured by Oxford Instruments.

This combination of technology, called “Focus SD (source-detector)”, has been optimized for the measurement of a wide range of sulfur from low ppm to high %, and uses just one calibration line for all matrix types. On other instruments/techniques, e.g. Wavelength Dispersive XRF (D2622) or polarized EDXRF, when the sample type (matrix) changes often a matrix-matched calibration needs to be performed. It can be difficult to find the correct matrix type for the standards, often the user is not sure which calibration to choose, and in the worst case reporting the incorrect results! The X-Supreme overcomes all of these difficulties with the Focus SD approach.

Further Reading:
          Review the Application Brief for Ultra Low Sulfur Analysis
          Learn more about ASTM Method D4294

Ultra Low Sulfur Test Equipment Sales     Oxford XRF XSupreme8000