忘了些出处了List of reagents, test solutions, and volumetric solutions， International Chemical Reference Substances are available from the WHO Collaborating Centre for Chemical Reference Substances, Apoteket AB, Produktion & Laboratorier Centrallaboratoriet, ACL, Prismavägen 2, S-141 75 Kungens Kurva, Sweden. (Fax: +46 8 740 60 40; email:who.apl@apoteket.se)
R:Substance or solution defined under reagents. Rf:Used in chromatography to indicate the ratio of the distance travelled by a substance to the distance travelled by the solbent front. 这段话抄至欧洲药典
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