EPA Method 500 Series Internal Standard #5 Back Catalog number: 30004 Manufacturer: ABSOLUTE STANDARDS Availability: 3 weeks Price on request - + Recommended 674534 Benzyldimethyldodecylammonium chloride, 10.0 µg/ml Price on request 94152 Semi-Volatile Standard Price on request CLM-351-1.2 Hexachlorobenzene (13C6, 99%), 100µg/ml in Nonane, 1,2ml Price on request