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Author: stephen long

Displaying records 11 to 20 of 35 records.
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11. Measuring silver nanoparticle dissolution in complex biological and environmental matrices using UV-Visible absorbance
Published: 8/2/2011
Authors: Justin M Zook, Stephen E Long, Danielle Cleveland, Carly Lay Geronimo, Robert I. MacCuspie
Abstract: Distinguishing the toxic effects of nanoparticles (NPs) themselves from the well-studied toxic effects of their ions is a critical but challenging measurement for nanotoxicity studies and regulation. This measurement is especially difficult for silv ...

12. Measurements of Methylmercury, Ethylmercury, and Inorganic Mercury Species in a Whole Blood Standard Reference Material: SRM 955c Toxic Elements in Caprine Blood
Published: 10/28/2010
Authors: William C Davis, Stephen E Long
Abstract: Trace elemental speciation analysis is assuming more critical importance in nutritional and toxicological assessments, and despite the necessity to quantitatively differentiate elemental species in environmental and clinical samples, there are a limi ...

13. IMEP-28: Total Arsenic, Cadmium, Lead and Mercury in Food Supplements
Published: 10/30/2009
Authors: 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
Abstract: 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 compari ...

14. Demonstrating the Comparability of Certified Reference Materials
Published: 7/24/2009
Authors: David Lee Duewer, Katrice A Lippa, Stephen E Long, Karen E Murphy, Katherine E Sharpless, Lorna Tregoning Sniegoski, Michael James Welch
Abstract: 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 throu ...

15. Fish-Related Standard Reference Materials
Published: 2/1/2009
Authors: Michele M Schantz, Steven J Christopher, William C Davis, Russell D Day, Jennifer M Keller, John R Kucklick, Stephen E Long, Elizabeth A Mackey, Barbara J. Porter, Dianne L Poster, Katherine E Sharpless, Gregory C Turk, Stephen A Wise
Abstract: The National Institute of Standards and Technology (NIST) has developed four Standard Reference Materials (SRMs) related to the monitoring of contaminants in fish and marine mammals: SRM 1588b Organics in Cod Liver Oil, SRM 1945 Organics in Whale Blu ...

16. Development and Certification of the New SRM 695 Trace Elements in Multi-Nutrient Fertilizer
Published: 10/1/2007
Authors: Elizabeth A Mackey, Mark P Cronise, Curtis N Fales, Robert Russ Greenberg, Stefan D Leigh, Stephen E Long, Anthony F Marlow, Karen E Murphy, Rabia Oflaz, John R Sieber, Laura J Wood, M. S. Rearick, Lee Lijian Yu, Stephen A. Wilson, Paul H. Briggs, Zoe A. Brown, J. Budahn, P. F. Kane, W L Marshall

17. Improved Certified Values for Total Mercury and Speciated Mercury in NIST Standard Reference Materials Using Isotope Dilution ICP-MS
Published: 10/1/2007
Authors: Stephen E Long, William C Davis, Steven J Christopher, Jacqueline L Mann, William R. Kelly

18. On the Certification of Cadmium at Trace and Ultratrace Levels in Standard Reference Materials Using ID ICP-MS
Published: 10/1/2007
Authors: Karen E Murphy, Stephen E Long, Robert D Vocke Jr

19. Characterization of a Suite of Ginkgo-Containing Standard Reference Materials
Published: 9/1/2007
Authors: 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 Louis 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

20. Improved Certified Values for Total Mercury and Speciated Mercury in NIST SRMs Using Isotope Dilution ICP-MS
Published: 6/1/2007
Authors: Stephen E Long, William C Davis, Russell D Day, Steven J Christopher, Jacqueline L Mann, William R. Kelly
Abstract: Recent improvements in total mercury and mercury speciation measurement capabilities at the National Institute of Standards and Technology have resulted in enhanced sensitivity, selectivity and accuracy in a wide range of matrix reference materials. ...

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