1. Standard Test Methods for Elemental Analysis of Lubricant and Additive Components - Barium, Calcium, Phosphorus, Sulfur, and Zinc by Wavelength-Dispersive X-Ray Fluorescence Spectroscopy;ASTM D4927,2015
2. Standard Test Method for Determination of Calcium, Chlorine, Copper, Magnesium, Phosphorus, Sulfur, and Zinc in Unused Lubricating Oils and Additives by Wavelength Dispersive X-ray Fluorescence Spectrometry;ASTM D6443,2014
3. Standard Test Method for Determination of Phosphorus, Sulfur, Calcium, and Zinc in Lubrication Oils by Energy Dispersive X-ray Fluorescence Spectroscopy;ASTM D6481,2014
4. Standard Test Method for Determination of Additive Elements in Lubrication Oils by EDXRF Analysis;ASTM D7751,2016
5. A novel total reflection X-ray fluorescence procedure for the direct determination of trace elements in petrochemical products;Cinosi;Anal. Bioanal. Chem.,2011