Sulfur Analysis in Fuels: SPECTRO XEPOS Achieves Detection Limit of 1 mg/kg
Recently there has been an international push to reduce the limits of sulfur in fuels. By 2010, the maximum allowed content of sulfur will decrease to 10 mg/kg in gasoline and 50 mg/kg in diesel fuel. For analyses methods used in the petrochemical industry this means, in turn, that the detection limit should be a factor of 10 less than the required limits. Thus, conventional energy-dispersive X-ray fluorescence analysis, the cost-effective and user-friendly standard method for oil laboratories, will become obsolete.
The technologically advanced ED-XRF SPECTRO XEPOS, however, achieves the required sulfur detection limit of less than 1 mg/kg. The primary reason for this can be found in the proprietary polarized excitation radiation, which enables an almost complete suppression of the spectral background, increasing sensitivity by a factor of four versus conventional energy-dispersive X-ray fluorescence spectrometers. A high-resolution, peltier cooled, Si drift chamber is used as a detection system, eliminating the need for liquid nitrogen cooling.
One calibration for all measurement ranges
The new low-sulfur application is provided by SPECTRO precalibrated. The settings are pre-programmed so that the instrument can be used for measurements in the range of sulfur-free fuels (0 - 10 mg/kg), low-sulfur fuels (10 - 50 mg/kg) and standard fuels (50 - 500 mg/kg) within one analytical method setup. The scope of supply includes newly developed, leak-proof, sample cups, which ensure a constant distance between the sample and detector increasing analytical precision.
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