Chromium(VI) (Cr +6) Speciation Standard at 100 µg/mL in 2% HNO3. 500 mL.12 months expiry date. Certificate of Analysis includes lot-specific chromatogram. Traceable to NIST SRM 3112 for total chromium concentration and by IC against a second source standard for the speciated form. ISO 9001:2015 certified, ISO/IEC 17025:2017 and ISO 17034:20166 accredited.