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Chemistry

Analytical chemistry

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  • Published Date
Displaying 1426 - 1450 of 2094

Ionizing Radiation-Induced Destruction of Benzene and Dienes in Aqueous Media

March 28, 2006
Author(s)
M I. Al-Sheikhly, Dianne L. Poster, Jung-Chul An, Pedatsur Neta, Joseph Silverman, Robert E. Huie
Pulse radiolysis with spectrophotometric and conductometric detection was utilized to study the formation and reactions of radicals from benzene and dienes in aqueous solutions. The benzene OH adduct, C6H6OH, reacts with O2 (k = 3 x 108 L mol-1 s-1) in a

Dietary Supplement Standard Reference Materials

March 27, 2006
Author(s)
Lane C. Sander, Katherine E. Sharpless, Stephen A. Wise
A new category of Standard Reference Materials based on dietary supplements are under development by NIST, with certified values for organic constituents and selected trace elements. These materials are provided primarily for use in method development and

Conformational Changes Associated With Receptor-Stimulated Guanine Nucleotide Exchange in a Heterotrimeric G-Protein a-Subunit: NMR Analysis of the GTPgS-Bound States

March 17, 2006
Author(s)
K D. Ridge, N G. Abdulaev, Xi-Cheng Zhang, T Ngo, D M. Brabazon, John P. Marino
Solution NMR studies of a 15N-labeled G-protein ?-subunit (G?) chimera (15N-ChiT) reconstituted heterotrimer have previously shown that binding of ??-subunits induces a pre-activated conformation in G? that may facilitate interaction with R* and guanine

CCQM-K13.1 Subsequent Key Comparison: Cadmium and Lead in Sediment

February 1, 2006
Author(s)
Robert R. Greenberg
CCQM-K13.1 is a Subsequent Key Comparison for Cadmium and Lead in Sediment conducted to provide the opportunity for two NMIs to demonstrate and document improvements in measurement capability achieved since the conduct of CCQM-K13, Amount content of

CCQM-K31 Key Comparison: Arsenic in Shellfish

February 1, 2006
Author(s)
Robert R. Greenberg, Elizabeth A. Mackey
A Key Comparison (CCQM-K31) of the determination of arsenic in a marine shellfish (oyster tissue) was conducted under the auspices of the CCQM Inorganic Analysis Working Group as a follow-up to the CCQM-P11 Pilot Study. Arsenic was present at naturally

Determination of Polybrominated Diphenyl Ethers in Indoor Dust Standard Reference Materials

February 1, 2006
Author(s)
H M. Stapleton, T. Harner, M. Shoeib, Jennifer M. Lynch, Michele M. Schantz, Stefan D. Leigh, Stephen A. Wise
Polybrominated diphenyl ethers (PBDEs) have been measured for the first time in three different indoor dust Standard Reference Materials (SRMs) prepared by the National Institute of Standards and Technology (NIST). Two of these SRMs (2583 and 2584) have

Preparation of Reference Material 8504, Transformer Oil

February 1, 2006
Author(s)
Dianne L. Poster, Michele M. Schantz, Stephen A. Wise
A new reference material (RM), RM 8504, has been prepared for use as a diluent oil with Aroclors in transformer oil Standard Reference Materials (SRMs) 3075-3080 or SRM 3090 when developing and validating methods for the determination of polychlorinated

CCQM -K39- DETERMINATION OF CHLORINATED PESTICIDES IN SOLUTION: FINAL REPORT

October 12, 2005
Author(s)
CCQM OAWG, Michele M. Schantz, David L. Duewer, Willie E. May, Reenie M. Parris, Stephen Wise
Solutions of known mass fraction of organic analytes of interest are typically used to calibrate the measurement processes used in the determination of these analytes. Appropriate value assignments and uncertainty calculations for these calibration

CCQM K40 DETERMINATION OF PCB CONGENERS IN SOLUTION: FINAL REPORT

October 5, 2005
Author(s)
David L. Duewer, Willie E. May, Reenie M. Parris, Michele M. Schantz, Stephen A. Wise
Abstract. Solutions of known mass fraction of organic analytes of interest are typically used to calibrate the measurement processes used in the determination of these analytes. Appropriate value assignments and uncertainty calculations for these
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