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 of Key Comparison CCQM-K4 (Ethanol in Air)



M J. Milton, C Brookes, A Marschal, Franklin R. Guenther, George C. Rhoderick, D E. Leer, L W. Zhen, C Takahashi, E Deak, Y A. Kustikov


This key comparison involved primary standards of ethanol in air maintained at eight laboratories. The nominal amount fraction of the standards used for the comparison was 120 mmol/mol which is typical of the levels used to calibrate evidential breath analysers in many countries. Such standards fulfil the agreed OIML requirements for the calibration of evidential breath-alcohol analysers and are able to provide a more accurate calibration at field level than ethanol/water solution-based simulators which have a high sensitivity to variations in the temperature of the solution.


CCQM, ethanol, gas standard, key comparison


Milton, M. , Brookes, C. , Marschal, A. , Guenther, F. , Rhoderick, G. , Leer, D. , Zhen, L. , Takahashi, C. , Deak, E. and Kustikov, Y. (2021), Final Report of Key Comparison CCQM-K4 (Ethanol in Air), Metrologia (Accessed February 23, 2024)
Created October 12, 2021