This Standard Reference Material (SRM) is intended for use as a primary calibration standard for the quantitative determination of calcium. A unit of SRM 3109a consists of five 10 mL sealed borosilicate glass ampoules of an acidified aqueous solution prepared gravimetrically to contain a known mass fraction of calcium. The solutioncontains nitric acid at a volume fraction of approximately 10 %, equivalent to an amount-of-substance concentration (molarity) of approximately 1.6 mol/L. For more information, please refer to the SDS and COA.SRM 3109A_cert SRM 3109A _SDS
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