EPA Method 8260B Internal Standard Back Catalog number: 22213 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 71980 1,trans-2,cis-4-Trimethylcyclohexane Price on request N0600000 Nicotinamide, 50mg Price on request 91297 EPA Method 525.2 - 526 Internal Standard Price on request