EPA Method 8240A Internal Standard Back Catalog number: 22003 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 10459.42-50-ME TRIS - Tetraphenylrecorcinol bis(diphenylphosphate) Trimer, 99% (LC) in Methanol Price on request 72052 trans-1,3-Dichloropropene-d4 Price on request 681374 Quinclorac, 100mg Price on request