Internal Standard Stock Solution, 1.2ml, nonane Back Catalog number: EPA-1668IS Manufacturer: Wellington Laboratories Availability: 1 week Price on request - + Recommended 677604 2-Quinoxalinecarboxylic acid, 100mg Price on request 1313.10-100-IO 1-Fluoronaphthalene, 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 321-38-0 Price on request 83551 Isobutyraldehyde-DNPH Price on request