Reagecon's Ammonium Standard for Ion Chromatography (IC) 0.05 mg/mL (50 ppm) in H?O is manufactured from ultra-pure material. This product is manufactured gravimetrically. Prior to bottling, the final product is tested and verified using a state of the art ion chromatograph and is reported using the gravimetric result, corrected for density, to a specification of ± 0.2%. The results are reported in mg/kg and mg/L on the basis of weight and density. Reagecon holds ISO/IEC 17025 accreditation for calibration of laboratory balances (INAB Ref: 265C). All of the measurement and gravimetric functions are carried out under a highly regulated temperature regime. Reagecon holds ISO/IEC 17025 for Temperature Calibration in the range of -90 C to 650 C (INAB Ref: 265C) and ISO/IEC 17025 accreditation for density measurement using Oscillating U-Tube and Bingham Pycnometry Methods (INAB Ref: 264T). - GHS/OSHA compliant, REACH - This product is produced in a highly controlled cleanroom (ISO 7) environment, using ultra-pure water (specially treated for the production of ion chromatography standards) and triple leached pre-cleaned bottles. All of the uncertainties of measurement for the product are calculated according to Eurachem/CITAC guidelines and reported as expanded uncertainties at the 95% confidence level.