TN calibration standard kit (30 mL each) for combustion based TOC analyzers, consisting of: preparation water, 1.0, 2.5, 5.0, 10 and 15 mg/L N based on Bovine Serum Albumin (BSA) as protein reference material for QC testing of e.g. vaccines. Used for TN calibration of multi N/C 2100S pharma according OQ protocol. TN calibration standard kit (30 mL each) for combustion based TOC analyzers, consisting of: preparation water, 1.0, 2.5, 5.0, 10 and 15 mg/L N based on Bovine Serum Albumin (BSA) as protein reference material for QC testing of e.g. vaccines. Used for TN calibration of multi N/C 2100S pharma according OQ protocol.