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Chemistry

Analytical chemistry

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Displaying 376 - 400 of 2094

Analysis of Iron in Water using a Simple LED Spectrophotometer

February 15, 2019
Author(s)
Benjamin J. Place
Access to clean water is a vitally important part of the lives of all people, yet there is often a concern about the contamination of water by heavy metals. The detection and measurement of heavy metals in water can be performed using colorimetric reagents

Headspace Analysis: Purge and Trap

February 15, 2019
Author(s)
Thomas J. Bruno, Megan E. Harries
Headspace analysis is a technique for sampling and examining the volatiles in a solid or liquid sample. The term headspace refers to the volume of vapor above a condensed phase sample. Purge and trap refers to the headspace technique in which volatile

Headspace Analysis: Static

February 15, 2019
Author(s)
Thomas J. Bruno, Megan E. Harries
Headspace analysis is a technique for sampling and examining the volatiles in a solid or liquid sample. The term headspace refers to the volume of vapor above a condensed phase sample. For most headspace analyses, the sample and its associated headspace

ASTM E2677: Web-based International Standard on Limit of Detection for Explosive Trace Detectors (and More) - Opioids and Ozone

February 12, 2019
Author(s)
R M. Verkouteren, Nathanael A. Heckert, Stefan D. Leigh, Edward R. Sisco, James E. Norris, Jeffrey A. Lawrence, Amber Burns
The performance characteristics of explosive and narcotic trace detectors are mission-critical to agencies worldwide that are charged with protection of the public, defense for mass transit and infrastructure, and the safety of first responders. Commercial

A status of temporal trends of persistent organic pollutants in Arctic biota

February 1, 2019
Author(s)
Frank Riget, Anders Bignert, Birgit Braune, Maria Dam, Rune Dietz, Marlene Evans, Norman Green, Helga Gunnlaugsdottir, Katrin S. Hoydal, John Kucklick, Robert Letcher, Derek Muir, Stacy Schuur, Christian Sonne, Stern Gary, Gregg Tomy, Katrin Vorkamp, Simon Wilson
More than 1000 time-series of persistent organic pollutants (POPs) in Arctic biota from marine and freshwater ecosystems some extending back to the beginning of 1980s were analyzed using a robust statistical method. The Arctic area encompassed extended

Proceedings of the First Workshop on Standards for Microfluidics

January 28, 2019
Author(s)
Darwin R. Reyes-Hernandez, Henne van Heeren
In the last two decades, the microfluidics/lab-on-a-chip field has evolved from the concept of micro total analysis systems, where systems with integrated pretreatment and analysis of chemicals were envisioned, to what is known today as lab-on-a-chip

Real-time liquid-phase organic reaction monitoring with a mid-infrared dual frequency comb spectrometer

January 10, 2019
Author(s)
Daniel I. Herman, Eleanor M. Waxman, Gabriel G. Ycas, Fabrizio R. Giorgetta, Nathan R. Newbury, Ian R. Coddington
We combine high-resolution mid-infrared dual-comb spectroscopy with attenuated total reflectance measurements to provide in-situ monitoring of a chemical reaction. The mid-infrared dual-comb spectrometer measures quantitative absorption cross-sections of

Towards quality assurance and quality control in untargeted metabolomics studies

January 3, 2019
Author(s)
Richard Beger, Warwick B. Dunn, Abbas Bandukwala, Bianca Bethan, David Broadhurst, Clary B. Clish, Surendra Dasari, Leslie Derr, Annie Evans, Steve Fischer, Thomas Flynn, Thomas Hartung, David Herrington, Richard Higashi, Ping-Ching Hsu, Christina Jones, Maureen Kachman, Helen Karuso, Gary Kruppa, Katrice Lippa, Padma Maruvada, Jonathan D. Mosley, Ionna Ntai, Clair O?Donovan, Mary Playdon, Daniel Raftery, Daniel Shaughnessy, Amanda Souza, Timothy Spaeder, Barbara Spalholz, Mukesh Verma, Tilman Walk, Ian Wilson, Daniel Bearden, Krista Zanetti
We describe here the agreed upon first development steps and priority objectives of a community engagement effort to address current challenges in quality assurance (QA) and quality control (QC) in untargeted metabolomic studies. This has included (1) a QA

Transformation of Engineered Nanomaterials through the Prism of Silver Sulfidation

January 1, 2019
Author(s)
Fan Zhang, Andrew J. Allen, Aaron C. Johnston-Peck, Jingyu Liu, John M. Pettibone
Structure transformation of engineered nanomaterials (ENMs) often dictates their efficacy, safety, and environmental impact. To address the existing significant knowledge gap regarding the fundamental kinetic rate and extent of ENMs transformation in

Cross-Ring Fragmentation Patterns in the Tandem Mass Spectra of Underivatized Sialylated Oligosaccharides and Their Special Suitability for Spectrum Library Searching

December 18, 2018
Author(s)
M. L. De Leoz, Yamil Simon, Robert J. Woods, Stephen E. Stein
Reference spectral library searching, while widely used to identify compounds in other areas of mass spectrometry, is not commonly used in glycomics. Building on a study by Cotter and coworkers on analysis of sialylated oligosaccharides using atmospheric

Aflatoxin-guanine DNA Adducts and Oxidatively-induced DNA Damage in Aflatoxin-treated Mice in vivo as Measured by Liquid Chromatography-Tandem Mass Spectrometry with Isotope-dilution

December 11, 2018
Author(s)
Erdem Coskun, Pawel Jaruga, Vladimir Vartanian, Onur Erdem, Patricia Egner, John D. Groopman, R. S. Lloyd, Miral M. Dizdar
Dietary exposure to aflatoxin (AFB1) is a significant reason for the incidence of hepatocellular carcinomas globally. AFB1-exposure leads to the formation of AFB1-N7-guanine (AFB1-N7-Gua) and two diastereomers of 8,9-dihydro-8-(2,6-diamino-4-oxo-3,4

Optimization of Folch, Bligh-Dyer, and Matyash Sample-to-Extraction Solvent Ratios for Mammalian Cell- and Plasma-Based Lipidomics Studies

December 11, 2018
Author(s)
John Bowden, Candice Z. Ulmer, Christina Jones, Richard A. Yost, Timothy J. Garrett
In order to investigate changes in the lipidome, analysis by ultra-high performance liquid chromatography - high resolution mass spectrometry (UHPLC-HRMS) typically requires the extraction of lipid content from sample matrices using optimized, matrix

Validation of Single Particle ICP-MS for Routine Measurements of Nanoparticle Size and Number Size Distribution

November 25, 2018
Author(s)
Antonio R. Montoro Bustos, Premsagar P. Kavuri, Antonio M. Possolo, Natalia Farkas, Andras Vladar, Karen E. Murphy, Michael R. Winchester
Single particle inductively coupled plasma-mass spectrometry (spICP-MS) is an emerging technique capable of measuring nanoparticle size and number concentration simultaneously, of metal-containing nanoparticles (NPs) at environmentally relevant levels

Health Assessment Measurements Quality Assurance Program: Exercise 1 Final Report

November 19, 2018
Author(s)
Chuck Barber, Bruce A. Benner Jr., Jeanice M. Brown Thomas, Carolyn Burdette, Johanna Camara, Stephen E. Long, Jacolin Murray, Melissa M. Phillips, Benjamin Place, Kate Rimmer, Laura J. Wood, Susan Tai, Siva K. Chinthalapati, Lee L. Yu
The NIST Health Assessment Measurements Quality Assurance Program (HAMQAP) was launched in collaboration with the National Institutes of Health (NIH) Office of Dietary Supplements (ODS) in 2017. HAMQAP was established to enable laboratories to improve the
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