EPA Method 507 Analyte Mix #8 Back Catalog number: 94131 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 683738 4-Bromofluorobenzene, 100 µg/ml, Acetonitrile, 5 Price on request ULM-7312-1.2 Perchloric acid, sodium salt, 100µg/mL in Water, 1 Price on request 9382.17-1G Alprazolam, neat, Solvent-neat, Unit 1g, # of units-1, Cas.no. 28981-97-7 Price on request