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Title
Statistics in the Laboratory: The Minimum Consistently Detectable Amount
Tuesday, September 05, 2017
Stanley N. Deming
In the previous column we discussed the limit of detection LD, the minimum signal strength above which we can be confident that analyte is present, but with a small false positive risk a that analyte ...
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How to Avoid Size Mismatch Between Solutes and Column Pores for Optimum HPLC Performance
Wednesday, June 07, 2017
Richard A. Henry
Stephanie Schuster
This article describes a new approach for selecting optimum column pores for separating large molecules without losing high performance.
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Statistics in the Laboratory: The Limit of Detection
Wednesday, June 07, 2017
Stanley N. Deming
The phrase “limit of detection” sounds so simple, yet it leads to one of the biggest, murkiest, most frustrating swamps in the statistical literature.
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Fume Hoods and Cabinets
Friday, May 19, 2017
Biological safety cabinets and fume hoods protect samples, personnel and the laboratory environment from harsh chemicals or infectious substances.
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Quantitating VOCs in Serum Using Automated Headspace-SPME/Cryo-Focusing/Isotope Dilution/Capillary GC/MS
Friday, March 31, 2017
Paul R. Loconto
In January 2007, the author’s lab received a frozen shipment of calibration standards and quality control (QC) samples to perform method validation for quantitating traces of volatile organic ...
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Comparison of ICP-QQQ and MP-AES to Alternative Atomic Spectroscopy Techniques
Friday, February 17, 2017
Shane Elliott
This article gives an overview of the various atomic spectroscopy techniques available to address a range of applications in environmental science, food and agriculture, life sciences and academic ...
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Lab Vacuum Pumps: Selection and Protection
Friday, February 17, 2017
Peter Coffey
Useful tips are given for choosing the right vacuum pump for the lab.
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Comparison of Crystallization Behavior of Different-Colored Polypropylene Parts Using a Single DSC Experiment
Friday, January 20, 2017
James A. Browne
A compositional analysis may explain the reasons for variations in processing behavior, but is time consuming and expensive. As an alternative, straightforward differential scanning calorimetry (DSC) ...
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High-Throughput VOC and Inorganic Gas Analysis: Automated SIFT-MS
Friday, January 20, 2017
Mark J. Perkins
Vaughan S. Langford
Murray J. McEwan
A sensitive technique called selected ion flow tube mass spectrometry (SIFT-MS) allows the direct, real-time monitoring of inorganic gases and volatile organic compounds (VOCs), with no need to ...
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Integration of a Dilution Module in a Mass Spectrometry-Based Online Reaction Monitoring System
Friday, January 20, 2017
Heidi Fleischer
Kerstin Thurow
Vinh Quang Do
Dany Hoffmann
A dilution module based primarily on a mass rate attenuator solves the problem of high concentration solution to the mass spectrometer. The low-flow compensation approach was used to circumvent the ...
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Closing the Consumption Gap: Making GC More Accessible
Friday, November 04, 2016
Eric Denoyer
Paul Deitrick
Gas chromatography users agree on at least two things: that GC is a mature technology, and that the performance and features of instrumentation largely meet the application requirements for which GC ...
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Comparative QC Test Methods for Toothpaste Consistency
Tuesday, September 27, 2016
Robert McGregor
Important quantitative data can be obtained in the study of viscosity by measuring the consistency of toothpaste, i.e., thickness, ease of handling and ability to retain position, and observing the ...
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Statistics in the Laboratory: The Capability of a Measurement Process
Tuesday, September 27, 2016
Stanley N. Deming
Measurement processes must be fit for use. In this column, we’ll develop some quantitative statistical descriptors of the capability of a measurement process to be valid for its intended purpose.
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Urinary Drug Testing: Small Changes for Big Improvements in Sensitivity
Tuesday, September 27, 2016
Jenny Cybulski
An oversight or mistake in drug testing can have dire consequences—a positive drug test can ruin the possibility of employment, turn an accident into a lawsuit, or cause a physician to discontinue ...
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High-Pressure Ion Chromatography Enables Fast, Reliable Analysis of Inorganic Cations and Ammonium in Environmental Water Samples
Thursday, September 01, 2016
Carl Fisher
Common alkali and alkaline earth cations are not considered primary drinking water contaminants, but alkaline water can potentially interfere with water clarification and disinfection procedures and ...
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Automated Chromatographic Solid-Phase Extraction Using an Autosampler
Thursday, September 01, 2016
Mark Hayward
Jonathan Ho
Rick Youngblood
Matthew T. Hardison
Tom Moran
Kim Gamble
Solid-phase extraction (SPE) is a preferred tool for isolating target analytes from complex matrices because the availability of a diverse range of chromatographic sorbents enables targeted approaches...
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Automated Liquid Chromatography Method Development Design and Practice
Thursday, September 01, 2016
Gary W. Yanik
Method development bottlenecks can be minimized with good planning, setup, procedures and techniques.
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Considerations for Diffuse Reflection Spectroscopy
Thursday, September 01, 2016
Stacey Carrier
Reflected light allows us to perceive the world around us.
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Automating Solvent Removal From Winterized Cannabis Oil Extract
Wednesday, August 31, 2016
Alison Wake
Jim Bilotta
A centrifugal evaporator is compared to a rotary evaporator for the batch concentration of winterized cannabis extract in ethanol.
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Selecting a GC Inlet Liner
Tuesday, July 26, 2016
Linx Waclaski
Introduction of gas chromatography samples typically occurs through a heated inlet containing a glass liner.
Read More
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