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Search Publications by: Kenneth W. Pratt (Assoc)

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Displaying 1 - 15 of 15

NIST's Engagement with CCQM Studies from 1992 to 2023: History and Performance

May 21, 2024
Author(s)
David L. Duewer, Christina Cecelski, Megan Cleveland, Nancy Lin, Katrice Lippa, Jacqueline L. Mann, John L. Molloy, Michael Nelson, James E. Norris, Kenneth W. Pratt, Sumona Sarkar, Hratch G. Semerjian, Robert L. Watters
This report documents the engagement and measurement performance of the National Institute of Standards and Technology (NIST) in studies coordinated by the Consultative Committee for Amount of Substance: Metrology in Chemistry and Biology (CCQM) from 1992

Methods for the SI Value Assignment of the Purity of Organic Compounds (IUPAC Technical Report)

January 18, 2023
Author(s)
David L. Duewer, Katrice Lippa, Brian Lang, Blaza Toman, Michael Nelson, Kenneth W. Pratt, Steven Westwood, Yoshitaka Yoshitaka Shimuzu, Takeshi Saito, Beatrice Lalerle, Xinhua Dai, Stephen Davies, Marina Ricci, Annarita Baldan, Stefan Sarge, Haifeng Wang, Ralf D. Josephs, Michal Mariassy, Dietmar Pfieffer, John Warren, Wolfram Bremser, Stephen L.R. Ellison, Ting Huang, Ales Fajgelj, Lindsey Mackay, Robert Wielgosz
Metrological traceability to the SI of the result of an analysis for an organic compound is achieved through a calibration hierarchy anchored in a primary calibrator of the compound, the mass fraction content of which is established in a manner traceable

Degrees of Equivalence for Chemical Measurement Capabilities: Primary pH

September 10, 2014
Author(s)
David L. Duewer, Kenneth W. Pratt, Chainarong Cherdchu, Nongluck Tangpaisarnkul2 Nongluck Tangpaisarnkul2, Akiharu Hioki, Masaki Ohata, Petra Spitzer, Michal M?ri?ssy, Leo? Vysko?il
The Key Comparison (KC) studies of the Consultative Committee for Amount of Substance – Metrology in Chemistry (CCQM) help ensure the reliability of chemical and biochemical measurements relevant to international trade and environmental , health , and

Origin and Early History of Die Methode des Eichzusatzes or The Method of Standard Addition with Primary Emphasis on Its Origin, Early Design, Dissemination, and Usage of Terms

June 1, 2011
Author(s)
William R. Kelly, Kenneth W. Pratt, William F. Guthrie, Keith R. Martin
The Method of Standard Additions or the Standard Addition Method, often referred by its acronym as just SAM, is now a proverbial workhorse in both inorganic and organic quantitative analytical chemistry and in related disciplines such as geochemistry. Its

Major Applications of Electrochemical Techniques at National Metrology Institute

March 24, 2009
Author(s)
M Mariassy, Kenneth W. Pratt, Petra Spitzer
A review of the state of the art of electrochemical methods at the highest metrological level in National Metrology Institutes (NMIs) in given, with emphasis on standardization work (primary methods) in the fields of pH and electrolytic conductivity, as

Visualization Technique for Uncertainty Budgets: Onion Charts

October 16, 2008
Author(s)
Kenneth W. Pratt, David L. Duewer
A concise graphical depiction, the onion chart, is described for presenting uncertainty budgets for any measurand, y, having a set of component variances, ui2(y). The onion chart consists of a concentric series of rings. Each ring is constructed from the

k=2 and Other Sometimes Hidden Assumptions in Chemical Measurement Uncertainty Intervals

April 24, 2006
Author(s)
David L. Duewer, S L. Ellison, William F. Guthrie, D B. Hibbert, C Jackson, A Kallner, Stefan D. Leigh, Reenie M. Parris, Kenneth W. Pratt, Michele M. Schantz, Katherine E. Sharpless
A recent interlaboratory study that required individual analysts to estimate uncertainty intervals for their results revealed that some experienced chemical analysts have difficulty with measurement uncertainty calculations. To help validate assumptions

Improvements in the Winkler Titration for Iodide in Iodized Salt

Author(s)
Kenneth W. Pratt, Karen E. Murphy
A bromine gas generator, based on bleach, potassium bromide and dilute hydrochloric acid, replaces hazardous pure bromine used in the classical Winkler titration for iodide. This modification eliminates the need to store or use pure bromine. The gas