reference standard Articles

  • Utilizing Restek reference standards for residual solvent testing

    Restek manufactures several different residual solvent standards.  These can be used for testing according to USP, the EP monograph, or other residual solvent assays, such as medical cannabis testing.   The calculations involved for the use of these standards has led to questions for our technical team.  This post should help provide guidance for their usage.  I’ll ...


    By Restek Corporation

  • Is it time to upgrade the PM2.5 federal reference method?

    The fine particulate matter (PM2.5) Federal Reference Method (FRM) has in many respects been a great success. When the method was implemented, there was some doubt that the state and local monitoring agencies that routinely provide air quality data would be able to manage a program, which often distinguishes one location from another by just a few μg/m3. As it turns out, data from the FRM ...

  • Regional inhibition of cholinesterase in free‐ranging western pond turtles (Emys marmorata) occupying California mountain streams

    The present study investigated the potential effects of cholinesterase (ChE)‐inhibiting pesticides on western pond turtles (Emys marmorata) occupying streams in two regions of California, USA. The southern region was suspected of having increased exposure to atmospheric deposition of contaminants originating from Central Valley agriculture. The northern region represented reference ChE ...


    By John Wiley & Sons, Ltd.

  • Enabling interoperability of STEP Application Protocols at meta-data and knowledge level

    Numerous proposals exist worldwide for the representation of data models and services for the main manufacturing activities. The ISO10303 STEP has developed more than 40 standard Application Protocols for product data representation, and they reflect the consolidated expertise of major industrial worldwide specialists working together for more than 20 years, covering the principal product data ...


    By Inderscience Publishers

  • Calibration – the sure way to accurate measurements

    Calibration   During testing, microphones and accelerometers can change sensitivity or break. They might look intact, but what happens if you continue measuring without having calibrated your transducer? Can you trust your data? Do you have to redo the entire test? In cases of extreme testing you might only have one shot at getting your measurement right as the product gets ...

  • News on Food 2013, Volume 2: Simplify Sample Prep, and Increase Speed and Sensitivity

    Analytical testing is used 1) to determine nutritional value and quality and 2) to ensure food safety and security. We have developed and continue to develop, specialized products that allow food analysts to simplify sample prep, and increase speed and sensitivity for many food and beverage applications. In this second issue of “News On Food”, we will focus on our continuously ...


    By MilliporeSigma

  • Oil and grease in waste water

    Determination of oil and grease in waste water according to Standard Methods AWWA 5520 This Application Note describes the extraction and determination of oil and grease from waste water samples following Standard Methods 5520 part D (Soxhlet Extraction Method). “Oil and grease” is defined as any material recovered as a substance soluble in the solvent. Therefore, compounds ...


    By BÜCHI Labortechnik AG

  • Effect of gold nanoparticles and ciprofloxacin on microbial catabolism: A community‐based approach

    The effect of gold nanoparticles (AuNPs) and ciprofloxacin on the catabolism of microbial communities was assessed. This was accomplished through an ex‐situ methodology designed to give a priori knowledge on the potential for NPs, or other emerging contaminants, to affect the catabolic capabilities of microbial communities in the environment. Microbial communities from a variety of sources ...


    By John Wiley & Sons, Ltd.

  • Keeping Pace with PTP and CCRL

    Two, three or four times a year, laboratories around the world check their performance with testing programs from ASTM International’s Proficiency Testing Program and the Cement and Concrete Reference Laboratory. Using samples sent for a particular program cycle, labs run specific methods and submit their results to PTP and CCRL for analysis. Each lab then receives reports that serve as a ...


    By ASTM International

  • Field Dewpoint Measurement - How Good Are We ? - Case Study

    Recently BJ PPS Leeds dried a client system with nitrogen. Dewpoint was measured using a Michell ADM dewpoint meter which was connected to the system at different locations via a one metre long rubber hose. The instrument was allowed to stabilise for approximately five minutes before each reading was taken. Average result was in the region of -27.5 °C. A check of our nitrogen supply and the ...

  • New to ISO/IEC 17025 Accreditation or Accreditation in General?

    In a recent issue of Cal Lab: The International Journal of Metrology, ANAB’s Roger Muse provides a nice description of the ISO/IEC 17025 accreditation process. As Muse begins, “To the uninitiated, accreditation to ISO/IEC 17025 can seem mysterious, confusing, or ...


    By Qualtrax Inc

Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you