Reference Materials

• NIST Standard Reference Materials 
• Standard Reference Materials catalog by NIST.gov      from Sigma-Aldrich
  https://xpslibrary.com/wp-content/uploads/2019/07/nist-standard-reference-materials-catalogue-rtp.pdf

Certified Reference Materials

• ISO Guide 33: 2015 Reference materials Good practice in using reference materials
• European Reference Materials
• Canadian Reference Materials
• GeoReM (Geological and Environmental Reference Materials) Database – http://georem.mpch-mainz.gwdg.de/
• Certified Reference Materials from the European Commission

From Ted Pella

• Pure Element Standard Sets      https://www.tedpella.com/Calibration_html/UHV-EL_Reference_Standards_for_EDS_WDS.htm#elements_compounds