EPA Method 548.1 Internal Standard Back Catalog number: 30078 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 673710 Tolclofos-methyl, 100 µg/ml, Ethyl acetate, 5ml Price on request 57127 Cobalt (Co) Price on request F865002 Furosemide-d5, 1mg Price on request