The National Institute of Standards and Technology (NIST, Gaithersburg, Maryland) has published a reference guide to the modern metric system that covers the correct U.S. usage of metric units.
The National Institute of Standards and Technology (NIST, Gaithersburg, Maryland) has published a reference guide to the modern metric system that covers the correct U.S. usage of metric units. "The International System of Units (SI)" describes recent changes in the system since 1998. The publication includes accepted spellings of various units as well as a chapter on units for quantities that describe biological effects and symbols for expressing values for enzyme catalytic activity. The U.S. Omnibus Trade and Competitiveness Act of 1988 designated the metric system as the preferred weights and measures system for U.S. trade and commerce, and U.S. Public Law 110-69 in 2007 replaced the old definition of the metric system with the SI definition.
Sustainable Green Solvents in Microextraction: A Review of Recent Advancements
March 27th 2024Conventional sample preparation can be time- and resource-consuming, and a green analytical methodology can be a game-changer for scientists, in addition to facilitating selective and sensitive separations.
Transferring Methods to Compact and Portable HPLC
February 14th 2024The current trend in laboratory equipment design is the miniaturization of laboratory instruments. Smaller-scale HPLC instruments offer benefits that cannot be matched by analytical-scale equipment, especially in the areas of portability, reduced fluid volumes, and reduced operating costs. Yet, the miniaturization of laboratory equipment has brought with it a unique set of challenges, including transferring methods to compact LC. Capillary LC expands the use of LC to applications not currently done using conventional LC in a wide array of application areas, including pharmaceutical, food and beverage, petrochemical, environmental, and oil and gas. Greg Ward, Axcend’s CEO wrote, “Customers want an HPLC system with a small footprint, low flow rates and green chemistry.” Join his podcast where he shares method transfer in these application areas.
High-Throughput Analysis of Volatile Compounds in Air, Water, and Soil Using SIFT-MS (Apr 2024)
March 27th 2024This study demonstrates high-throughput analysis of BTEX compounds from several matrices (air, water and soil). Detection limits in the single-digit part-per-billion concentration range (by volume) are readily achievable within seconds using SIFT-MS, because sample analysis is achieved without chromatography, pre-concentration, or drying. We also present a calibration approach that enables speciation of ethylbenzene from the xylenes in real time.