USP codes L1-L88 specify various silica-based packing types for HPLC analysis. Packings range from 1.5-10 μm diameter silica particles to monolithic rods. Supelco offers multiple packing types including Titan, Ascentis, and Discovery
Solid pharmaceutical primary standard from EDQM. Synonyms include tromethamine, THAM, and Tris base. Empirical formula: C4H11NO3. Storage class code: 11 (Combustible Solids)
IR spectroscopy analyzes chemical compounds without destroying samples. Based on absorption, emission, or scattering of infrared radiation. Works with any sample in any state: powder, paste, gas films. Six types of molecular vibrations: stretching, bending, rocking, twisting, wagging
Crucibles originated in Eastern Europe and Iran around 6th/5th millennium BC. Early crucibles were shallow clay vessels heated from above. Chalcolithic crucibles featured handles and pouring spouts. Roman crucibles evolved into conical vessels heated from below. Medieval crucibles became larger, reaching 60 cm for bell production
BPCRS are primary standards established using absolute methods. BPCRS should only be used for chemical analysis, not for food or animals. All orders must be placed through BP Website
Pure water has pH of 7, indicating neutrality. pH scale ranges from 0 to 14, with 7 being neutral. pH measures acidity or alkalinity through hydrogen ion changes