Heptachlor, 1000µg/ml in Hexane, 1ml Back Catalog number: 79022 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 50215 Nitrite (NO2-) as N Price on request 81203 EPA Method 8121 Internal Standard Price on request 684555 D7-o-Toluic acid, 50mg Price on request