EPA Method 515.1 Internal Standard Back Catalog number: 31023 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended DHCH d-1,2,3,4,5,6-Hexachlorocyclohexane, 1.2mL x 100ug/mL, nonane Price on request 10982.9-50MG (±)-Vanillomandelic acid-d3,neat,neat,50mg, Price on request 59405 Cations Solution C Price on request