Total Kjeldahl Nitrogen as N Back Catalog number: 50767 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended EPA-8280CC3 Calibration Verification Solution , 1ml, nonane Price on request 93900 Aliphatic Hydrocarbon Calibration Set Price on request 1078.19-K-IO n-Tridecylbenzene, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 123-02-4 Price on request