Reagecon's Niobium Standard 10,000 µg/mL (10,000 ppm) in H₂O and trace HF for ICP or ICP-MS is manufactured from ultra-pure metal (99.999%) and it is tested by an ISO17025 Accredited Test Method (INAB Ref: 264T). The raw material used in this standard is assayed by titration and ICP-MS prior to manufacture. Separate CRM’s are used to control or calibrate the titration and ICP-MS respectively. This product is manufactured gravimetrically using the mass balance approach: 100% less the sum of all impurities (w/w). Prior to bottling, the final product is tested and verified using ICP-MS and it is certified using the gravimetric result, corrected for density. To as specification of ± 0.2%. The certified results are reported and certified in mg/kg and mg/L on the basis of weight and density. Reagecon hold ISO/IEC 17025 accreditation for calibration of laboratory balances (INAB Ref: 265C). All of the volumetric, titrimetric and gravimetric functions are carried out under a highly regulated temperature regime. Reagecon hold ISO/IEC 17025 for Temperature Calibration in the range of -196 to +1200°C (INAB Ref: 265C) and ISO/IEC 17025 Accreditation for density measurement using Oscillating U-Tube and Bingham Pycnometry Methods (INAB Ref: 264T).