EPA Method 515.1 Internal Standard Back Catalog number: 30023 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended B447395-1MG Bis(4-hydroxyphenyl) Sulfone O-Beta-D-Glucuronide Sodium Salt, 1mg Price on request 71311 Phthalic acid Price on request 12001.32-K-IO Di-n-didodecyl phthalate,1000 µg/mL,isooctane,1mL, Price on request