미국
SRM 3143 Rhenium (Re) Standard Solution Lot No. 140825
This Standard Reference Material (SRM) is intended for use as a primary calibration standard for the quantitative determination of rhenium. A unit of SRM 3143 consists of five 10 mL sealed borosilicate glass ampoules of an acidified aqueous solution prepared gravimetrically to contain a known mass fraction of rhenium. The solution contains nitric acid at a volume fraction of approximately 10 %, equivalent to an amount of substance concentration (molarity) of approximately 1.6 mol/L. This data is public in the Certificate of Analysis for this material.