EPA Method 8121 Internal Standard Back Catalog number: 81203 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 92605 WS PAH Calibration Level 4 Price on request 673448 Terbuthylazine, 10.0 µg/ml, Acetonitrile, 10ml Price on request 1039.18-200-T 2,7-Dimethylpyrene, 200µg/mL, Solvent-toluene, Unit 1mL, # of units-1, Cas.no. 15679-24-0 Price on request