EPA Method 551.1 Internal Standard Back Catalog number: 30103 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 90982 Nitrosamine Standard Price on request 673860 Azoxystrobin, 10.0 µg/ml, Acetonitrile, 10ml Price on request 95551 2-Naphthylamine Price on request