Internal Standard Solution, 1.2ml, nonane Back Catalog number: EPA-23IS Manufacturer: Wellington Laboratories Availability: 1 week Price on request - + Recommended 675248 Proquinazid, 100 µg/ml, Acetonitrile, 5ml Price on request DPE-28 2,4,4'-Trichlorodiphenyl ether, 1.2ml x 50ug/ml, nonane Price on request 2292.9-1G 4-Methylphthalic acid, neat, Solvent-neat, Unit 1g, # of units-1, Cas.no. 4316-23-8 Price on request