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Displaying 1 - 25 of 32

International comparison CCQM-K10.2018: BTEX in nitrogen at 5 nmol mol-1

February 18, 2022
Author(s)
Christina Cecelski, George C. Rhoderick, Antonio Possolo, Jennifer Carney, Miroslav Vokoun, Jitka Privoznikova, Sangil Lee, Ji Hwan Kang, Yong Doo Kim, Dal Ho Kim, Tatiana Mace, Christophe Sutour, Celine Pascale, Napo Ntsasa, James Tshilongo, Mudalo Jozela, Nompumelelo Leshabane, Goitsemang Lekoto, David Worton, Paul Brewer, Fred Farrow-Dunn, Sergi Moreno, Klaus Wirtz, Volker Stummer, L.A. Konopelko, A.V. Kolobova, Y.A. Kustikov, A.Y. Klimov, O.V. Efremova, Janneke van Wijk, Adriaan van der Veen
The CCQM-K10.2018 comparison aimed to evaluate the capabilities of national metrology institutes (NMIs) to prepare and/or value assign primary reference mixtures containing benzene, toluene, ethylbenzene, p-xylene, m-xylene and o-xylene (subsequently

Final Report of Key Comparison CCQM-K4 (Ethanol in Air)

October 12, 2021
Author(s)
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

Pilot Comparison CCQM-P177 - Monoterpenes in Nitrogen at 2.5 nmol mol-1 Final Report

September 27, 2021
Author(s)
Christina Cecelski, George C. Rhoderick, Joseph T. Hodges, Antonio Possolo, Olaf Wilke
The growing awareness of climate change, and continuing concerns regarding tropospheric and stratospheric chemistry, will require future measurements and standards for compounds linked to these issues. To globally monitor and control the emissions of these

Stability of gaseous volatile organic compounds contained in gas cylinders with different internal wall treatments

July 29, 2019
Author(s)
George C. Rhoderick, Christina Cecelski, Walter R. Miller Jr., David Worton, Sergi Moreno, Paul Brewer, Joele Viallon, Faraz Idrees, Philippe Moussay, Yong D. Kim, Dal H. Kim, Sangil Lee, Annarita Baldan, Jianrong Li
Volatile organic compounds (VOCs) are a group of gas-phase compounds present in the atmosphere that affect air quality and Earth's climate. Halocarbons, a subset of this group, are strong greenhouse gases and are linked to stratospheric ozone depletion

CCQM K121 – Monoterpenes in Nitrogen at 2.5 nmol mol-1 Final Report

November 9, 2018
Author(s)
Christina E. Cecelski, George C. Rhoderick, Joseph T. Hodges, Antonio M. Possolo, Cassie A. Goodman, Yong D. Kim, Dal H. Kim, Sangil Lee, Nicholas Allen, Marivon Corbel, David Worton, Richard Brown, Paul Brewer
The growing awareness of climate change, and continuing concerns regarding tropospheric and stratospheric chemistry, will require future measurements and standards for compounds linked to these issues. To monitor and control the emissions of these species

NIST Standards for Measurement, Instrument Calibration, and Quantification of Gaseous Atmospheric Species

March 2, 2018
Author(s)
George C. Rhoderick, Michael E. Kelley, Walter R. Miller Jr., James E. Norris, Jennifer Carney, Lyn Gameson, Christina Cecelski, Cassie Goodman, Abneesh Srivastava, Joseph Hodges
There are many gas species present in the atmosphere that are associated with the earth’s climate. These compounds absorb and emit radiation, a process which is the fundamental cause of the greenhouse effect. The major greenhouse gases in the earth’s

Development of a Northern Continental Air Standard Reference Material

February 18, 2016
Author(s)
George C. Rhoderick, Duane Kitzis, Michael E. Kelley, Walter R. Miller Jr., Bradley Hall, Edward Dlugokencky, Pieter Tans, Antonio M. Possolo, Jennifer Carney
The National Institute of Standards and Technology (NIST) recently began to develop standard mixtures of greenhouse gases as part of a broad program mandated by the 2009 United States Congress to support research in climate change. To this end, NIST made

Comparison of halocarbon measurements in an atmospheric dry whole air sample

November 3, 2015
Author(s)
George C. Rhoderick, Bradley Hall, Christina Harth, Jin Seog Kim, Jeogsoon Lee, Stephen Montzka, J. Muhle, Stefan Reimann, Martin Vollmer, Ray Weiss
The growing awareness of climate change/global warming, and continuing concerns regarding stratospheric ozone depletion, will require continued measurements and standards for many compounds, in particular halocarbons that are linked to these issues. In

CCQM-K83 Draft A Report: International Comparison CCQM-K83 Halocarbons in Dry Whole Air

June 3, 2014
Author(s)
George C. Rhoderick, Franklin R. Guenther, David L. Duewer, Jeongsoon Lee, Jin Seog Kim, Dongmin Moon, Jinbok Lee
The growing awareness of climate change/global warming and continuing concerns regarding stratospheric ozone depletion will require future measurements and standards for many compounds, in particular halocarbons that are linked to these issues. In order to

CCQM-P151 Draft A Report Pilot Study CCQM P151 Halocarbons in Dry Whole Air

May 28, 2014
Author(s)
George C. Rhoderick, Franklin R. Guenther, David L. Duewer, Jeongsoon Lee, Jin S. Kim, Bradley Hall, Ray Weiss, Christina Harth, Stefan Reimann, Martin Vollmer
The growing awareness of climate change/global warming and continuing concerns regarding stratospheric ozone depletion will require future measurements and standards for many compounds, in particular halocarbons that are linked to these issues. In order to

International Comparison of a Hydrocarbon Gas Standard at the Picomol per Mol Level

February 6, 2014
Author(s)
George C. Rhoderick, David L. Duewer, Eric Apel, Annarita Baldan, Bradley Hall, Alice Harling, Detlev Helmig, Gwi S. Heo, Jacques Hueber, Mi E. Kim, Yong D. Kim, Benjamin Miller, Stephen Montzka, Daniel Reimer
Studies of climate change increasingly recognize the diverse influences of hydrocarbons in the atmosphere, including roles in particulates and ozone formation. Measurements of key non methane hydrocarbons (NMHCs) suggest atmospheric mole fractions ranging

Results from the International Halocarbons in Air Comparison Experiment (IHALACE)

June 1, 2013
Author(s)
Bradley Hall, George C. Rhoderick, A Engel, J. Muhle, J. W. Elkins, F. Artuso, E. Atlas, M. Aydin, D. Blake, E. G. Brunke, S. Chiavarini, P. J. Fraser, J. Happell, Paul B. Krummel, I. Levin, M. Loewenstein, M. Malone, S. A. Montzka, S. O'Doherty, S. Reimann, E. S. Saltzman, H. E. Scheel, L. P. Steele, M. K. Vollmer, R. F. Weiss, D. Worthy, Y. Yokouchi
The International Halocarbons in Air Comparison Experiment (IHALACE) was conducted to document relationships between calibrations scales among various laboratories that measure atmospheric greenhouse and ozone depleting gases. Six stainless steel cylinders

The Validation of Fourier-Transform Microwave Spectroscopy for Trace-Gas Analysis

February 1, 2002
Author(s)
Pamela M. Chu, R D. Suenram, Angela R. Hight Walker, R S. DaBell, George C. Rhoderick, Gerald T. Fraser
There is strong interest by regulatory agencies and automobile manufacturers, motivated in large part by increasingly stringent emission standards, for measurement tools capable of quantifying various hydrocarbons, oxygenated hydrocarbons, etc., in