Internal Standard ASTM D-5307 Back Catalog number: 51124 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 673995 Nitrofen, 10.0 µg/ml, Acetonitrile, 10ml Price on request 2290.8-1G Isophthalic acid, neat, Solvent-neat, Unit 1g, # of units-1, Cas.no. 121-91-5 Price on request 70097 Dacthal Price on request