EPA Method 551.1 Internal Standard Back Catalog number: 32103 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 685756 Phosmet-oxon, 100µg/ml in Acetonitrile, 1ml Price on request 9377.5-100MG Furfural-3,4,5-d3 (stabilized with BHT),neat,neat,100mg Price on request 677107 D5-Aclonifen, 100 µg/ml, Acetonitrile, 1ml Price on request