Standard Test Method for Sulfur in Gasoline, Diesel Fuel, Jet Fuel, Kerosine, Biodiesel, Biodiesel Blends, & Gasoline-Ethanol Blends by Monochromatic Wavelength Dispersive X-ray Fluorescence Spectrometry Analysis, Biodiesel, Diesel, Fuel, Gasoline, Jet fuel, Kerosine, Monochromatic X ray, MWDXRF, Spectrometry, Sulfur, Wavelength dispersive X-ray fluorescence, WDXRF, X-ray