Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Final Report: Key Comparison CCQM Pilot Ka35: Determination of Sulfur in Diesel Fuel



William R. Kelly, Robert D. Vocke Jr., Jacqueline L. Mann, Gregory C. Turk


The CCQM-K35 Key Comparison was organized by the Inorganic Analysis Working Group (IAWG) of the CCQM to test the capabilities of National Metrological Institutes (NMI s) to measure the sulfur content of diesel fuel at the 40 g/g level. Four NMI s participated in the Key Comparison: the Federal Institute for Materials Research and Testing (BAM), the Institute for Reference Materials and Measurements (IRMM), the Laboratory of the Government Chemist (LGC), and the National Institute of Standards and Technology (NIST). NIST designed and coordinated the study. All four laboratories used isotope dilution mass spectrometric techniques, but two laboratories (BAM and NIST) used thermal ionization mass spectrometry (TIMS) and two laboratories (IRMM and LGC) used inductively coupled plasma mass spectrometry (ICP-MS). Both techniques require spiking and combustion of the sample prior to the instrumental determination to quantify the amount of sulfur in the fuels. The agreement among the laboratories was good as evidenced by the small values for both the equivalence statements (Di


diesel fuel, isotope dilution, key comparison, sulfur


Kelly, W. , Vocke, R. , Mann, J. and Turk, G. (2007), Final Report: Key Comparison CCQM Pilot Ka35: Determination of Sulfur in Diesel Fuel, Metrologia, [online], (Accessed May 27, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created April 2, 2007, Updated February 17, 2017