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  • LC Columns: Pillars of Sample Purification and Analysis

    Monday, September 22, 2014
    Liquid chromatography columns, or LC columns, have been used in the food, chemical, petrochemical, and pharmaceutical industries and forensic, clinical, and medical determinations for sample purification and analysis. In an LC column, the sample ... Read More

  • Photodiode Array Detectors: An Array of Possibilities for (U)HPLC Detection

    Tuesday, August 19, 2014
    Photodiode array detectors—variously abbreviated as “PDA detectors” or simply “DADs”—are essentially spectrophotometers that transiently measure the absorbance of light by a liquid flowing past. They are the dominant detector type used in ... Read More

  • Lab Technology Face Off: ICP-AES vs. ICP-OES vs. ICP-MS

    Thursday, July 17, 2014
    The specificity of elemental analysis required and the laboratory budget are the biggest considerations in choosing an ICP-OES system over an ICP-MS system. The amount of samples to be tested per day, as well as regulatory testing standards and ... Read More

  • Environmental Monitoring, Protein Determination, and Quality Control: An Introduction to Nitrogen Analyzers

    Thursday, April 24, 2014
    Nitrogen is a common element, present in every living organism. It is vital to lifecycles and important in many industrial processes in its different forms. Organic nitrogen occurs in proteins, peptides, nucleic acids, urea, and many synthetic ... Read More

  • GC Systems—Separating Compounds for Decades

    Friday, March 14, 2014
    Gas chromatography (GC), much like liquid chromatography (LC), is used to separate compounds by sending a mixture through a column with which the constituent compounds differentially interact, detecting them as they emerge. But while “LC compounds ... Read More

  • Take Your Samples Around the World in an Environmental Test Chamber

    Monday, February 17, 2014
    Did you ever wonder just how would your dependable lab equipment—or your smartphone, for that matter—function in, say, Antarctica? Or even just blocks from your home or lab? How long would your smartphone or tablet last if it were accidentally left ... Read More

  • Differential Scanning Calorimetry—A Fundamental Thermal Analysis Tool

    Thursday, October 24, 2013
    A differential scanning calorimeter (DSC) is a benchtop instrument used to determine thermodynamic transitions and heat capacities of a variety of substances. A small sample—typically 5–20 mg, around the size of the tip of a #2 pencil—is placed in ... Read More

  • Blood-Alcohol Analysis by HS-GC Using 0.15-i.d. Columns

    Friday, September 27, 2013
    Forensic laboratories face the need to analyze many samples of human blood and body fluids for alcohol content. The most important compound in blood-alcohol (BAC) analysis is ethanol, but the detection of several other significant alcohols and their ... Read More

  • Particle Sizing Systems: Key to QC and Product Testing

    Thursday, September 05, 2013
    A particle size analyzer, also known as a particle sizer, is used to measure the sizes of particles in a sample. It can also determine distributions of particle sizes. Read More

  • UHPLC: Pushing the Limits of HPLC

    Friday, August 09, 2013
    For fields that rely on liquid chromatography, the standard today is usually ultra high-performance liquid chromatography (UHPLC). And with good reason—compared to its chromatography predecessors, UHPLC is faster, provides better separation, and... Read More

  • Measuring the Drug Concentration of Therapeutic Drugs and Drugs of Abuse

    Wednesday, August 07, 2013
    Today there are many assays that enable clinicians to assess the appropriate dosage of therapeutic drugs or to screen for the presence of drugs of abuse. Some of these products require laboratory support, but many simple test kits are suitable for ... Read More

  • Portable XRF: Nondestructive Testing in Seconds

    Monday, July 01, 2013
    We are all familiar with X-rays, the short, highly energetic waves used by dentists to check for cavities, and by airport screeners to look for contraband. We experience fluorescence—the phenomenon by which something absorbs energy and in turn ... Read More

  • Spectrophotometers Overview

    Tuesday, April 23, 2013
    Spectrophotometers measure the amount of light of a specific wavelength that is absorbed by a sample. A spectrophotometer is used chiefly to measure the concentration of analytes in solutions, but is also used to characterize liquid and solid ... Read More
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