EPA Method 500 Internal Standard #6 Back Catalog number: 30169 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended MHPCHLOR (13C10)Heptachlor, 1.2mL x 100ug/mL, nonane Price on request 679820 Sulfaquinoxaline sodium salt, 100 µg/ml, Methanol Price on request 94028 2002Mix 1 WY06 Concentrate Price on request