Description General description This certified reference material (CRM) is produced and certified in accordance with ISO/IEC 17025 and ISO 17034 (ISO Guide 34). This CRM is traceable to SI unit kg and measured against primary material from an NMI, e.g. NIST or BAM. Certified content incl. uncertainty and expiry date are given on the label. Information about trace impurities are stated on the certificate. Download your certificate at: http://www.sigma-aldrich.com. Analysis Note 1000 mg/L Cr(III) in 2% nitric acid, prepared with high purity Cr(NO3)3 x 9H2O, HNO3 and water Other Notes For a complete product listing of our TraceCERT range of CRMs for ICP and AAS, technical information and example certificates please visit our inorganic TraceCERT website Legal Information TraceCERT is a registered trademark of Sigma-Aldrich Co. LLC