Standard Test Methods for Chemical, Mass Spectrometric, and Spectrochemical Analysis of Nuclear-Grade Boron Carbide| weight loss on drying, water content, total carbon, total boron, titrimetry, TIMS, soluble boron, pyrohydrolysis, metallic impurities, mass spectrometry, mannitoboric acid procedure, isotopic composition, ion-selective electrode, infrared absorption, inductive furnace, ICP MS, ICP OES, free carbon, fluoride, DCArc OES, coulometry, constant-voltage coulometry, constant-current coulometry, combustion analysis, chloride, boron carbide, analytical methods