A reported purity value is meaningful only when interpreted together with the analytical method. Chromatographic area percentage, assay, mass balance, and spectroscopic identity measurements answer different questions.
Review the method context
Check the technique, detector, reference standard, sample preparation, integration approach, and reporting basis. Water, residual solvent, inorganic content, or counterions may not be represented by a single chromatographic purity result.
Match analysis to intended use
Research, process-development, and regulated applications may require different specifications and supporting data. Define acceptance criteria before selecting a material or commissioning custom testing.