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Sulfur Analysis in Crude Oil and High-Sulfur Fuels by WDXRF According to ASTM D2622-10
Date:12/4/2012

The Woodlands, TX (PRWEB) December 04, 2012

Rigaku Corporation has published a new application report demonstrating the capabilities of the Rigaku ZSX Primus II, a tube-below sequential wavelength dispersive X-ray fluorescence (WDXRF) spectrometer optimized for routine analysis as performed by today’s petroleum laboratories. Rigaku Application Note XRF 5016 demonstrates quantitative analysis of high concentration sulfur in crude oil, high-sulfur diesel fuel and residual fuel oil according to ASTM D2622-10.The report includes complete information about sample preparation, method calibration and repeatability.

Crude oil is a raw material for petroleum products and typically contains sulfur in varying concentrations up to 5 wt%. Sulfur compounds in petroleum can produce various harmful effects including air pollution, metal corrosion and catalyst degradation. Sulfur concentration in crude oil and high-sulfur fuels is therefore monitored or controlled in refinery and production processes within the petroleum industry.

X-ray fluorescence (XRF) spectrometry is an effective tool for quantitative analysis of sulfur in crude oil and high-sulfur fuels including bunker fuel, due in part to its simple sample preparation requirements. In XRF analysis of oils, samples are simply poured into liquid cells; concentration of total sulfur is then obtained without complicated treatments such as digestion or dilution.

As described in the report, measurements were performed on the ZSX Primus II equipped with a 3 kW X-ray tube operating at 30 kV, 80 mA using a germanium (Ge) analyzing crystal and the S4 slit, as included in the standard configuration. Standards comprised of crude oil, “Number 2 diesel fuel” and residual oil were used for calibration. Counting times were 20 seconds for peak and 10 seconds for background. Repeatability tests were carried out using a representative sample for each material.

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