EPA Method 500 Series Internal Std #4 Back Catalog number: 30003 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 72788 Diethylene glycol dimethyl ether Price on request 11765.12-100-IO 2,2',3,4,5,6,6'-Heptachlorobiphenyl ,100 µg/mL,isooctane,1mL, Price on request 19348 Hexachlorobenzene, 1000µg/ml in Isooctane, 1ml Price on request