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Search Publications by: Karen E. Murphy (Assoc)

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Displaying 26 - 50 of 54

Certification of NIST SRM 2569 Lead Paint Films for Children's Products

October 15, 2012
Author(s)
John L. Molloy, John R. Sieber, Karen E. Murphy, Stephen E. Long, Stefan D. Leigh
SRM 2569 Lead Paint Films for Children’s Products is a new Standard Reference Material (SRM) developed for use primarily with XRF instrumentation. It consists of three paint coatings, with nominally 0 mg/kg, 90 mg/kg, and 300 mg/kg of Pb added, on

Development and Certification of Green Tea-Containing Standard Reference Materials

November 30, 2011
Author(s)
Lane C. Sander, Mary Bedner, Michael C. Tims, James H. Yen, David L. Duewer, Barbara J. Porter, Steven J. Christopher, Russell D. Day, Stephen E. Long, John L. Molloy, Karen E. Murphy, Brian E. Lang, Rachel A. Lieberman, Laura J. Wood, M. Payne, M. C. Roman, J. M. Betz, A. NguyenPho, Katherine E. Sharpless, Stephen A. Wise
A suite of three green tea-containing Standard Reference Materials (SRMs) has been issued by the National Institute of Standards and Technology (NIST). The materials are characterized for catechins, xanthine alkaloids, theanine, and toxic elements. As many

Chromatographic Methods for the Quantification of Free and Chelated Gadolinium Species in MRI Contrast Agent Formulations

October 3, 2010
Author(s)
Danielle Cleveland, Stephen E. Long, Lane C. Sander, William C. Davis, Karen E. Murphy, Catherine A. Rimmer, Lorena Francini, Anil K. Patri
Speciation measurements of gadolinium in liposomal MRI contrast agents are complicated by the presence of emulsifiers, surfactants, and therapeutic agents in the formulations. The present paper describes two robust, hyphenated chromatography methods for

Certification of Three NIST Renewal Soil Standard Reference Materials(R) for Element Content: SRM 2709a San Joaquin Soil, SRM 2710a Montana Soil I, and SRM 2711a Montana Soil II

June 1, 2010
Author(s)
Elizabeth A. Mackey, Christopher S. Johnson, Richard M. Lindstrom, Stephen E. Long, Anthony F. Marlow, Karen E. Murphy, Rick L. Paul, Rachel S. Popelka-Filcoff, Savelas A. Rabb, John R. Sieber, Rabia Oflaz, Bryan E. Tomlin, Laura J. Wood, James H. Yen, Lee L. Yu, Rolf L. Zeisler, S. A. Wilson, M. G. Adams, Z. A. Brown, P. L. Lamothe, J. E. Taggart, C. Jones, J. Nebelsick
For the past 20 y, the National Institute of Standards and Technology has provided three soil Standard Reference Materials certified for element content: SRM 2709 San Joaquin Soil (Baseline Trace Element Concentrations); SRM 2710 Montana Soil I (Highly

IMEP-28: Total Arsenic, Cadmium, Lead and Mercury in Food Supplements

October 30, 2009
Author(s)
Lane C. Sander, Stephen E. Long, Steven J. Christopher, Russell D. Day, Karen E. Murphy, Ines Baer, Beatriz de la Calle, Inge Verbist, Danny Vendelbo, Hakan Emteborg, Philip Taylor
The Institute for Reference Materials and Measurements (IRMM) of the Joint Research Centre (JRC), a Directorate-General of the European Commission, operates the International Measurement Evaluation Programme IMEP. It organises interlaboratory comparisons

Report of the Sixth Interlaboratory Comparison Organized by the Community Reference Laboratory for Heavy Metals in Feed and Food

September 1, 2009
Author(s)
Lane C. Sander, Stephen E. Long, Steven J. Christopher, Russell D. Day, Karen E. Murphy, F. Cordeiro, T. Linsinger, H. Emteborg, I. Verbist, D. Vendelbo, P. Taylor, M. B. de la Calle
The Institute for Reference Materials and Measurements (IRMM) of the Joint Research Centre (JRC), a Directorate-General of the European Commission, operates the Community Reference Laboratory for Heavy Metals in Feed and Food (CRL-HM). One of its core

Demonstrating the Comparability of Certified Reference Materials

July 24, 2009
Author(s)
David L. Duewer, Katrice A. Lippa, Stephen E. Long, Karen E. Murphy, Katherine E. Sharpless, Lorna T. Sniegoski, Michael J. Welch
Certified Reference Materials (CRMs) enable the meaningful comparison of measurement results over time and place. When CRMs are used to calibrate or verify the performance of a measurement system, results produced by that system can be related through the

CHALLENGES AND SUCCESS FOR NEUTRON ACTIVATION ANALYSIS PROCEDURES IN VALUE ASSIGNMENT OF ANIMAL SERUM AND BOVINE LIVER STANDARD REFERENCE MATERIALS

June 12, 2009
Author(s)
Rolf L. Zeisler, Robert R. Greenberg, Elizabeth A. Mackey, Karen E. Murphy, Rabia Oflaz, Bryan E. Tomlin
Analyses for value assignment in the renewal SRMs 1598a Animal Serum and SRM 1577c Bovine Liver included extensive characterization by neutron ac-tivation analysis (NAA). For the determination of Al, V, Mn, and Cu the inter-fering reaction 31P(n,alpha)28Al

Comparison of Clinical Methods with Isotope Dilution ICP-MS for the New Standard Reference Material 955c Lead In Caprine Blood

May 26, 2009
Author(s)
Karen E. Murphy, Thomas W. Vetter, Gregory C. Turk, Christopher D. Palmer, Miles E. Lewis, Ciaran M. Geraghty, Patrick J. Parsons, William F. Guthrie
The National Institute of Standards and Technology (NIST) has developed Standard Reference Material (SRM) 955c, a new caprine-based, four-level blood standard with certified blood lead levels (BLLs) ranging from 0.4 µg/dL (0.02 µmol/L) Pb to 45 µg/dL (2.17

Certification of Standard Reference Materials for Bitter Orange

July 1, 2008
Author(s)
Lane C. Sander, K. Putzbach, Bryant C. Nelson, Catherine A. Rimmer, Mary Bedner, Jeanice M. Brown Thomas, Barbara J. Porter, Laura J. Wood, Michele M. Schantz, Karen E. Murphy, Katherine E. Sharpless, Stephen A. Wise, James H. Yen, P. H. Siitonen, R. I. Evans, A. NguyenPho, M. C. Roman, J. M. Betz

Trophic Transfer of Nanoparticles in a Simplified Food Web

May 30, 2008
Author(s)
Richard D. Holbrook, Karen E. Murphy, Jayne B. Morrow, Kenneth D. Cole
Nanotechnological innovations depend largely on the unique chemical and physical properties of engineered nanomaterials. However, the same properties that make engineered nanomaterials attractive for numerous applications also contribute to their

Characterization of a Suite of Ginkgo-Containing Standard Reference Materials

September 1, 2007
Author(s)
Catherine A. Rimmer, S. Howerton, Katherine E. Sharpless, Lane C. Sander, Stephen E. Long, Karen E. Murphy, Barbara J. Porter, K. Putzbach, M. S. Rearick, Stephen A. Wise, Laura J. Wood, Rolf L. Zeisler, Diane K. Hancock, James H. Yen, J. M. Betz, A. NguyenPho, L. Yang, C. Scriver, S. N. Willie, R. Sturgeon, B. Schaneberg, C. Nelson, J. Skamarack, M. Pan, L. Kerri, D. Gray, E. H. Waysek, A. Blatter, E. Reich

Preparation and Characterization of a Suite of Ephedra-Containing Standard Reference Materials

November 1, 2006
Author(s)
Katherine E. Sharpless, David L. Anderson, Therese A. Butler, J. M. Betz, Douglas A. Howell, S. G. Capar, J. Cheng, C. Fraser, G. Gardner, T. Ihara, J. W. Lam, Stephen E. Long, Elizabeth A. Mackey, M. McCooeye, Karen E. Murphy, W. R. Mindak, S. Mitvalsky, Karen W. Phinney, Barbara J. Porter, A. NguyenPho, Lane C. Sander, M. C. Roman, Mary B. Satterfield, Jeanice M. Brown Thomas, C. Scriver, R. E. Sturgeon, Robert D. Vocke Jr., Stephen A. Wise, Laura J. Wood, James H. Yen, L. Yang, G. C. Ziobro

Preparation and Characterization of a Suite of Ephedra-Containing Standard Reference Materials

June 1, 2006
Author(s)
Katherine E. Sharpless, D L. Anderson, J. M. Betz, Therese A. Butler, S. G. Capar, J. Cheng, C. Fraser, M. L. Gay, G. Gardner, D W. Howell, T. Ihara, J. W. Lam, Stephen E. Long, M. McCooeye, Elizabeth A. Mackey, W. R. Mindak, S. Mitvalsky, Karen E. Murphy, Karen W. Phinney, A. NguyenPho, Barbara J. Porter, M. C. Roman, Lane C. Sander, Mary B. Satterfield, C. Scriver, R. E. Sturgeon, Jeanice M. Brown Thomas, Robert D. Vocke Jr., Stephen A. Wise, Laura J. Wood, L. Yang, James H. Yen, G. C. Ziobro

Determination of Cyanide in Blood by Isotope Dilution Gas Chromatography-Mass Spectrometry

March 31, 2006
Author(s)
Karen E. Murphy, Michele M. Schantz, Therese A. Butler, Bruce A. Benner Jr, Laura J. Wood, Gregory C. Turk
A procedure based on isotope dilution gas chromatography/mass spectrometry (ID GC/MS) has been developed for the accurate and rapid determination of cyanide (CN) in whole blood. A known amount of isotopically labeled potassium cyanide (K13C15N) is added as