Nearlyallthesamplespresentedtothepharmaceuticalanalystaremixtures,sometimesverycomplexones.Thedeterminationoftheamountofeachisolatedcomponentisusuallyasimplematter.Theanalysisofthesesamecomponentsineachother’spresencemay,however,bedifficultorevenimpossibl (共 2419 字) [阅读本文] >>