EPA Method 525.2 - 526 Internal Standard Back Catalog number: 91297 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 684992 5-Chloro-2-hydroxybenzophenone, 250mg Price on request D-4629-LB-CAL-R1- Nitrogen Calibration Set - Low Boiling Solvents, 8 x 1mL Price on request 682559 Acetanilide, 1000mg Price on request